How do I nest cases?












6















I am new to LaTeX. I know how to write basic equations in LaTeX. However, the following equation seems to be too difficult for me. Please help me with this. Thank you.



enter image description here










share|improve this question





























    6















    I am new to LaTeX. I know how to write basic equations in LaTeX. However, the following equation seems to be too difficult for me. Please help me with this. Thank you.



    enter image description here










    share|improve this question



























      6












      6








      6


      1






      I am new to LaTeX. I know how to write basic equations in LaTeX. However, the following equation seems to be too difficult for me. Please help me with this. Thank you.



      enter image description here










      share|improve this question
















      I am new to LaTeX. I know how to write basic equations in LaTeX. However, the following equation seems to be too difficult for me. Please help me with this. Thank you.



      enter image description here







      math-mode equations cases






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Mar 24 at 15:58









      JouleV

      10.3k22558




      10.3k22558










      asked Mar 24 at 6:00









      Nahid HossainNahid Hossain

      513




      513






















          3 Answers
          3






          active

          oldest

          votes


















          10














          I'd not use the inner brace, but a standard notation for the minimum, just split across lines.



          documentclass{article}
          usepackage{amsmath}

          DeclareMathOperator{lev}{lev}

          begin{document}

          begin{equation*}
          lev_{a,b}(i,j)=
          begin{cases}
          max(i,j) & text{if $min(i,j)=0$,} \[1ex]
          begin{aligned}[b]
          minbigl(lev_{a,b}&(i-1,j)+1, \
          lev_{a,b}&(i,j-1)+1, \
          lev_{a,b}&(i-1,j-1)+1_{(a_ine b_j)}
          bigr)
          end{aligned} & text{otherwise.}
          end{cases}
          end{equation*}

          end{document}


          enter image description here



          You might prefer the following realization, which is obtained by using begin{aligned} instead of begin{aligned}[b].



          enter image description here






          share|improve this answer
























          • It works. Thank you.

            – Nahid Hossain
            Mar 25 at 13:27



















          9














          amsmath's cases is defined for this. The horizontal space between the bracket and the inside contents is very good.



          documentclass{article}
          usepackage{amsmath}
          begin{document}
          [
          mathrm{lev}_{a,b}(i,j)=begin{cases}
          max(i,j)&text{if $min(i,j)=0$,}\
          minbegin{cases}
          mathrm{lev}_{a,b}(i-1,j)+1\
          mathrm{lev}_{a,b}(i,j-1)+1\
          mathrm{lev}_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
          end{cases} &text{otherwise.}
          end{cases}
          ]
          end{document}


          enter image description here





          It seems to me that you are writing a document which uses lev() function quite often. In this case, you should define a new macro to avoid repetition (I use DeclareMathOperator, which is the best way for this, thanks to egreg's suggestion in his comment).



          documentclass{article}
          usepackage{amsmath}
          %newcommand{lev}{mathrm{lev}}: not good
          DeclareMathOperator{lev}{lev}
          begin{document}
          [
          lev_{a,b}(i,j)=begin{cases}
          max(i,j)&text{if $min(i,j)=0$,}\
          minbegin{cases}
          lev_{a,b}(i-1,j)+1\
          lev_{a,b}(i,j-1)+1\
          lev_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
          end{cases} &text{otherwise.}
          end{cases}
          ]
          end{document}


          enter image description here






          share|improve this answer

































            2














            enter image description here



            If you use the function lev a lot then it is a good idea to define it as follows



            newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}



            Just type lev and you will get the function with two arguments to enter.



            documentclass{article}
            usepackage{amsmath}
            usepackage{booktabs}
            usepackage{array}

            begin{document}

            newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}
            begin{equation}
            lev{i}{j} = leftlbrace
            begin{array}{l l}
            max(i, thinspace j) & text{if~} min(i, thinspace j) =0,
            \
            min leftlbrace hspace{-1mm}
            begin{array}{l}
            lev{i-1}{j} + 1
            \
            addlinespace[0.5mm]
            lev{i}{j-1} + 1
            \
            addlinespace[0.5mm]
            lev{i-1}{j-1} + 1_{(a_{i} neq b_{j})}
            end{array}

            right. & text{otherwise}.
            end{array}
            right.
            end{equation}

            end{document}





            share|improve this answer
























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              3 Answers
              3






              active

              oldest

              votes








              3 Answers
              3






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes









              10














              I'd not use the inner brace, but a standard notation for the minimum, just split across lines.



              documentclass{article}
              usepackage{amsmath}

              DeclareMathOperator{lev}{lev}

              begin{document}

              begin{equation*}
              lev_{a,b}(i,j)=
              begin{cases}
              max(i,j) & text{if $min(i,j)=0$,} \[1ex]
              begin{aligned}[b]
              minbigl(lev_{a,b}&(i-1,j)+1, \
              lev_{a,b}&(i,j-1)+1, \
              lev_{a,b}&(i-1,j-1)+1_{(a_ine b_j)}
              bigr)
              end{aligned} & text{otherwise.}
              end{cases}
              end{equation*}

              end{document}


              enter image description here



              You might prefer the following realization, which is obtained by using begin{aligned} instead of begin{aligned}[b].



              enter image description here






              share|improve this answer
























              • It works. Thank you.

                – Nahid Hossain
                Mar 25 at 13:27
















              10














              I'd not use the inner brace, but a standard notation for the minimum, just split across lines.



              documentclass{article}
              usepackage{amsmath}

              DeclareMathOperator{lev}{lev}

              begin{document}

              begin{equation*}
              lev_{a,b}(i,j)=
              begin{cases}
              max(i,j) & text{if $min(i,j)=0$,} \[1ex]
              begin{aligned}[b]
              minbigl(lev_{a,b}&(i-1,j)+1, \
              lev_{a,b}&(i,j-1)+1, \
              lev_{a,b}&(i-1,j-1)+1_{(a_ine b_j)}
              bigr)
              end{aligned} & text{otherwise.}
              end{cases}
              end{equation*}

              end{document}


              enter image description here



              You might prefer the following realization, which is obtained by using begin{aligned} instead of begin{aligned}[b].



              enter image description here






              share|improve this answer
























              • It works. Thank you.

                – Nahid Hossain
                Mar 25 at 13:27














              10












              10








              10







              I'd not use the inner brace, but a standard notation for the minimum, just split across lines.



              documentclass{article}
              usepackage{amsmath}

              DeclareMathOperator{lev}{lev}

              begin{document}

              begin{equation*}
              lev_{a,b}(i,j)=
              begin{cases}
              max(i,j) & text{if $min(i,j)=0$,} \[1ex]
              begin{aligned}[b]
              minbigl(lev_{a,b}&(i-1,j)+1, \
              lev_{a,b}&(i,j-1)+1, \
              lev_{a,b}&(i-1,j-1)+1_{(a_ine b_j)}
              bigr)
              end{aligned} & text{otherwise.}
              end{cases}
              end{equation*}

              end{document}


              enter image description here



              You might prefer the following realization, which is obtained by using begin{aligned} instead of begin{aligned}[b].



              enter image description here






              share|improve this answer













              I'd not use the inner brace, but a standard notation for the minimum, just split across lines.



              documentclass{article}
              usepackage{amsmath}

              DeclareMathOperator{lev}{lev}

              begin{document}

              begin{equation*}
              lev_{a,b}(i,j)=
              begin{cases}
              max(i,j) & text{if $min(i,j)=0$,} \[1ex]
              begin{aligned}[b]
              minbigl(lev_{a,b}&(i-1,j)+1, \
              lev_{a,b}&(i,j-1)+1, \
              lev_{a,b}&(i-1,j-1)+1_{(a_ine b_j)}
              bigr)
              end{aligned} & text{otherwise.}
              end{cases}
              end{equation*}

              end{document}


              enter image description here



              You might prefer the following realization, which is obtained by using begin{aligned} instead of begin{aligned}[b].



              enter image description here







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered Mar 24 at 10:08









              egregegreg

              731k8919303250




              731k8919303250













              • It works. Thank you.

                – Nahid Hossain
                Mar 25 at 13:27



















              • It works. Thank you.

                – Nahid Hossain
                Mar 25 at 13:27

















              It works. Thank you.

              – Nahid Hossain
              Mar 25 at 13:27





              It works. Thank you.

              – Nahid Hossain
              Mar 25 at 13:27











              9














              amsmath's cases is defined for this. The horizontal space between the bracket and the inside contents is very good.



              documentclass{article}
              usepackage{amsmath}
              begin{document}
              [
              mathrm{lev}_{a,b}(i,j)=begin{cases}
              max(i,j)&text{if $min(i,j)=0$,}\
              minbegin{cases}
              mathrm{lev}_{a,b}(i-1,j)+1\
              mathrm{lev}_{a,b}(i,j-1)+1\
              mathrm{lev}_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
              end{cases} &text{otherwise.}
              end{cases}
              ]
              end{document}


              enter image description here





              It seems to me that you are writing a document which uses lev() function quite often. In this case, you should define a new macro to avoid repetition (I use DeclareMathOperator, which is the best way for this, thanks to egreg's suggestion in his comment).



              documentclass{article}
              usepackage{amsmath}
              %newcommand{lev}{mathrm{lev}}: not good
              DeclareMathOperator{lev}{lev}
              begin{document}
              [
              lev_{a,b}(i,j)=begin{cases}
              max(i,j)&text{if $min(i,j)=0$,}\
              minbegin{cases}
              lev_{a,b}(i-1,j)+1\
              lev_{a,b}(i,j-1)+1\
              lev_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
              end{cases} &text{otherwise.}
              end{cases}
              ]
              end{document}


              enter image description here






              share|improve this answer






























                9














                amsmath's cases is defined for this. The horizontal space between the bracket and the inside contents is very good.



                documentclass{article}
                usepackage{amsmath}
                begin{document}
                [
                mathrm{lev}_{a,b}(i,j)=begin{cases}
                max(i,j)&text{if $min(i,j)=0$,}\
                minbegin{cases}
                mathrm{lev}_{a,b}(i-1,j)+1\
                mathrm{lev}_{a,b}(i,j-1)+1\
                mathrm{lev}_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
                end{cases} &text{otherwise.}
                end{cases}
                ]
                end{document}


                enter image description here





                It seems to me that you are writing a document which uses lev() function quite often. In this case, you should define a new macro to avoid repetition (I use DeclareMathOperator, which is the best way for this, thanks to egreg's suggestion in his comment).



                documentclass{article}
                usepackage{amsmath}
                %newcommand{lev}{mathrm{lev}}: not good
                DeclareMathOperator{lev}{lev}
                begin{document}
                [
                lev_{a,b}(i,j)=begin{cases}
                max(i,j)&text{if $min(i,j)=0$,}\
                minbegin{cases}
                lev_{a,b}(i-1,j)+1\
                lev_{a,b}(i,j-1)+1\
                lev_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
                end{cases} &text{otherwise.}
                end{cases}
                ]
                end{document}


                enter image description here






                share|improve this answer




























                  9












                  9








                  9







                  amsmath's cases is defined for this. The horizontal space between the bracket and the inside contents is very good.



                  documentclass{article}
                  usepackage{amsmath}
                  begin{document}
                  [
                  mathrm{lev}_{a,b}(i,j)=begin{cases}
                  max(i,j)&text{if $min(i,j)=0$,}\
                  minbegin{cases}
                  mathrm{lev}_{a,b}(i-1,j)+1\
                  mathrm{lev}_{a,b}(i,j-1)+1\
                  mathrm{lev}_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
                  end{cases} &text{otherwise.}
                  end{cases}
                  ]
                  end{document}


                  enter image description here





                  It seems to me that you are writing a document which uses lev() function quite often. In this case, you should define a new macro to avoid repetition (I use DeclareMathOperator, which is the best way for this, thanks to egreg's suggestion in his comment).



                  documentclass{article}
                  usepackage{amsmath}
                  %newcommand{lev}{mathrm{lev}}: not good
                  DeclareMathOperator{lev}{lev}
                  begin{document}
                  [
                  lev_{a,b}(i,j)=begin{cases}
                  max(i,j)&text{if $min(i,j)=0$,}\
                  minbegin{cases}
                  lev_{a,b}(i-1,j)+1\
                  lev_{a,b}(i,j-1)+1\
                  lev_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
                  end{cases} &text{otherwise.}
                  end{cases}
                  ]
                  end{document}


                  enter image description here






                  share|improve this answer















                  amsmath's cases is defined for this. The horizontal space between the bracket and the inside contents is very good.



                  documentclass{article}
                  usepackage{amsmath}
                  begin{document}
                  [
                  mathrm{lev}_{a,b}(i,j)=begin{cases}
                  max(i,j)&text{if $min(i,j)=0$,}\
                  minbegin{cases}
                  mathrm{lev}_{a,b}(i-1,j)+1\
                  mathrm{lev}_{a,b}(i,j-1)+1\
                  mathrm{lev}_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
                  end{cases} &text{otherwise.}
                  end{cases}
                  ]
                  end{document}


                  enter image description here





                  It seems to me that you are writing a document which uses lev() function quite often. In this case, you should define a new macro to avoid repetition (I use DeclareMathOperator, which is the best way for this, thanks to egreg's suggestion in his comment).



                  documentclass{article}
                  usepackage{amsmath}
                  %newcommand{lev}{mathrm{lev}}: not good
                  DeclareMathOperator{lev}{lev}
                  begin{document}
                  [
                  lev_{a,b}(i,j)=begin{cases}
                  max(i,j)&text{if $min(i,j)=0$,}\
                  minbegin{cases}
                  lev_{a,b}(i-1,j)+1\
                  lev_{a,b}(i,j-1)+1\
                  lev_{a,b}(i-1,j-1)+1_{(a_ine b_j)}
                  end{cases} &text{otherwise.}
                  end{cases}
                  ]
                  end{document}


                  enter image description here







                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited Mar 24 at 14:07

























                  answered Mar 24 at 6:09









                  JouleVJouleV

                  10.3k22558




                  10.3k22558























                      2














                      enter image description here



                      If you use the function lev a lot then it is a good idea to define it as follows



                      newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}



                      Just type lev and you will get the function with two arguments to enter.



                      documentclass{article}
                      usepackage{amsmath}
                      usepackage{booktabs}
                      usepackage{array}

                      begin{document}

                      newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}
                      begin{equation}
                      lev{i}{j} = leftlbrace
                      begin{array}{l l}
                      max(i, thinspace j) & text{if~} min(i, thinspace j) =0,
                      \
                      min leftlbrace hspace{-1mm}
                      begin{array}{l}
                      lev{i-1}{j} + 1
                      \
                      addlinespace[0.5mm]
                      lev{i}{j-1} + 1
                      \
                      addlinespace[0.5mm]
                      lev{i-1}{j-1} + 1_{(a_{i} neq b_{j})}
                      end{array}

                      right. & text{otherwise}.
                      end{array}
                      right.
                      end{equation}

                      end{document}





                      share|improve this answer




























                        2














                        enter image description here



                        If you use the function lev a lot then it is a good idea to define it as follows



                        newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}



                        Just type lev and you will get the function with two arguments to enter.



                        documentclass{article}
                        usepackage{amsmath}
                        usepackage{booktabs}
                        usepackage{array}

                        begin{document}

                        newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}
                        begin{equation}
                        lev{i}{j} = leftlbrace
                        begin{array}{l l}
                        max(i, thinspace j) & text{if~} min(i, thinspace j) =0,
                        \
                        min leftlbrace hspace{-1mm}
                        begin{array}{l}
                        lev{i-1}{j} + 1
                        \
                        addlinespace[0.5mm]
                        lev{i}{j-1} + 1
                        \
                        addlinespace[0.5mm]
                        lev{i-1}{j-1} + 1_{(a_{i} neq b_{j})}
                        end{array}

                        right. & text{otherwise}.
                        end{array}
                        right.
                        end{equation}

                        end{document}





                        share|improve this answer


























                          2












                          2








                          2







                          enter image description here



                          If you use the function lev a lot then it is a good idea to define it as follows



                          newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}



                          Just type lev and you will get the function with two arguments to enter.



                          documentclass{article}
                          usepackage{amsmath}
                          usepackage{booktabs}
                          usepackage{array}

                          begin{document}

                          newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}
                          begin{equation}
                          lev{i}{j} = leftlbrace
                          begin{array}{l l}
                          max(i, thinspace j) & text{if~} min(i, thinspace j) =0,
                          \
                          min leftlbrace hspace{-1mm}
                          begin{array}{l}
                          lev{i-1}{j} + 1
                          \
                          addlinespace[0.5mm]
                          lev{i}{j-1} + 1
                          \
                          addlinespace[0.5mm]
                          lev{i-1}{j-1} + 1_{(a_{i} neq b_{j})}
                          end{array}

                          right. & text{otherwise}.
                          end{array}
                          right.
                          end{equation}

                          end{document}





                          share|improve this answer













                          enter image description here



                          If you use the function lev a lot then it is a good idea to define it as follows



                          newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}



                          Just type lev and you will get the function with two arguments to enter.



                          documentclass{article}
                          usepackage{amsmath}
                          usepackage{booktabs}
                          usepackage{array}

                          begin{document}

                          newcommand{lev}[2]{mathrm{lev}_{a, thinspace b} (#1, thinspace #2)}
                          begin{equation}
                          lev{i}{j} = leftlbrace
                          begin{array}{l l}
                          max(i, thinspace j) & text{if~} min(i, thinspace j) =0,
                          \
                          min leftlbrace hspace{-1mm}
                          begin{array}{l}
                          lev{i-1}{j} + 1
                          \
                          addlinespace[0.5mm]
                          lev{i}{j-1} + 1
                          \
                          addlinespace[0.5mm]
                          lev{i-1}{j-1} + 1_{(a_{i} neq b_{j})}
                          end{array}

                          right. & text{otherwise}.
                          end{array}
                          right.
                          end{equation}

                          end{document}






                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered Mar 24 at 6:17









                          Al-Motasem AldaoudeyehAl-Motasem Aldaoudeyeh

                          1,871414




                          1,871414






























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