Cfrgtkky

I'm using the document class article and I would like to know if there is an easy way to write aligned equations with all letters automatically uprighted.

Since my equations contain lot of letters, I should use text each time.

Looking for it I found All letters upright in math mode (equivalent to rm) which suggests to use the mathrm command. Unfortunately it does not seem to work when it contains the & symbol (which is needed in order to align the equations).

documentclass{article}

usepackage[utf8]{inputenc}

usepackage{physics}



begin{document}



begin{align*}

    mathrm{TDD &= frac{18}{9} = 2'}\

    mathrm{TF &= TI-TDD = 25-2 = 23'}\

    text{TR} &= frac{18-5}{9} = 2'\

    text{TT} &= text{TI}+text{TRT}+text{TD}+text{TRS} = 25+2+5+1 = 33'

end{align*}



end{document}

You can not have & inside {} it is not really mathrm that is causing the error.

documentclass{article}

usepackage[utf8]{inputenc}

usepackage{physics}



begin{document}



Normal way

begin{align*}

    mathrm{TDD} &= frac{18}{9} = 2'\

    mathrm{TF} &= mathrm{TI}-mathrm{TDD} = 25-2 = 23'\

    mathrm{TR} &= frac{18-5}{9} = 2'\

    mathrm{TT} &= mathrm{TI}+mathrm{TRT}+mathrm{TD}+mathrm{TRS} = 25+2+5+1 = 33'

end{align*}



I wouldn't do this

 everymath{mathrm{xdeftmp{famthefamrelax}aftergrouptmp}}

begin{align*}

    TDD &= frac{18}{9} = 2'\

    TF &= TI-TDD = 25-2 = 23'\

    TR &= frac{18-5}{9} = 2'\

    TT &= TI+TRT+TD+TRS = 25+2+5+1 = 33'

end{align*}





end{document}

A literal answer to your question is the [math-style=upright] package option of unicode-math, which you can switch on and off with the commands

unimathsetup{math-style=upright}



unimathsetup{math-style=ISO}

For example:

documentclass[varwidth=10cm, preview]{standalone}

usepackage{physics}

usepackage[math-style=upright]{unicode-math}



begin{document}



begin{align*}

    TDD &= frac{18}{9} = 2' \

    TF &= TI-TDD = 25-2 = 23' \

    TR &= frac{18-5}{9} = 2' \

    TT &= TI+TRT+TD+TRS = 25+2+5+1 = 33'

end{align*}



end{document}

That said, I wouldn’t recommend you use this technique. (Although I do recommend that you use unicode-math if you’re allowed to!) The mathrm solution is still supported and will work fine.

I personally find it handy to declare something like newcommandTDD{ensuremath{mathop{mathrm{TDD}}}} and then write TDD in the equations. If you might for some reason want to write x TDD or TDD TI instead of x cdot TDD and TDD cdot TI, the mathop makes x TDD TI behave like log log x (that is, typeset like an operator name).

documentclass[varwidth=10cm, preview]{standalone}

usepackage[T1]{fontenc}

usepackage{physics}



newcommandupvar[1]{ensuremath{mathop{mathrm{#1}}}}

newcommandTD{upvar{TD}}

newcommandTDD{upvar{TDD}}

newcommandTF{upvar{TF}}

newcommandTI{upvar{TI}}

newcommandTR{upvar{TR}}

newcommandTRS{upvar{TRS}}

newcommandTRT{upvar{TRT}}

newcommandTT{upvar{TT}}



begin{document}



begin{align*}

    TDD &= frac{18}{9} = 2' \

    TF &= TI-TDD = 25-2 = 23' \

    TR &= frac{18-5}{9} = 2' \

    TT &= TI+TRT+TD+TRS = 25+2+5+1 = 33'

end{align*}



end{document}

This is just like typing log or sin. An existing shorthand for this is operatorname{TDD} from amsmath.