I found (nitpicking, I agree -- but that's what ##\TeX## does to you )$$(adsbygoogle = window.adsbygoogle || []).push({});

{dr\over dt} = {dr\over d\phi}{d\phi\over dt}$$ looking ugly and want to lift the two dr . However,

{dr\over dt} = {\vphantom {\phi} dr\over d\phi}{d\phi\over dt} didn't deliver as I expect:

$$

{\vphantom {\phi dr } dr\over dt} = {\vphantom {\phi} dr\over d\phi}{d\phi\over dt}$$ where omitting the \vphantom does take care of the lifting :

$$

{ dr\over dt} = {{\phi} \ dr\over d\phi}{d\phi\over dt}$$ (but I of course don't want the ##\phi##)

anyone have a tip how to get this done ?

PS the ordinary \phantom does work as I expect -- vertically as well as horizontally:

$$

{\phantom {\phi } dr\over dt} = {\phantom {\phi} dr\over d\phi}{d\phi\over dt}$$

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# Getting \vphantom to work

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