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I took the liberty of changing this

${\displaystyle \Delta y_{1}^{s}=y_{1}(p_{1}',m')-y_{1}(p_{1},m)={\text{Ys -Y1}}.}$</math>

to this:

${\displaystyle \Delta y_{1}^{s}=y_{1}(p_{1}',m')-y_{1}(p_{1},m)=Y_{s}-Y_{1}.}$

If for some reason the "text" style is needed for Ys and Y1, could one not write this

${\displaystyle \Delta y_{1}^{s}=y_{1}(p_{1}',m')-y_{1}(p_{1},m)={\text{Ys}}-{\text{Y1}}.}$

with a proper minus sign instead of that stupid-looking hyphen? Contrast the two:

${\displaystyle {\begin{aligned}{\text{hyphen:}}&\qquad \Delta y_{1}^{s}=y_{1}(p_{1}',m')-y_{1}(p_{1},m)={\text{Ys-Y1}}.\\{\text{minus sign:}}&\qquad \Delta y_{1}^{s}=y_{1}(p_{1}',m')-y_{1}(p_{1},m)={\text{Ys}}-{\text{Y1}}.\end{aligned}}}$

Michael Hardy ( talk) 17:40, 12 February 2019 (UTC)