[Tex/LaTex] the capital Greek letter for tau?


I would like to typeset the capital Greek letter for tau. I used \Tau, but I got error for that:

Undefined control sequence.

My preamble is


I was wondering what goes wrong?

Best Answer

since many of the greek uppercase letters have the same shape as latin letters, they were not separately provided for tex, for two reasons:

  • to save space (which was a real consideration in 1980);

  • because it wouldn't be possible to tell the difference between the two shapes.

the first reason is no longer relevant, of course, but the second is.

go ahead and define your own:


for latex, or

\def\Tau{{\rm T}}

if you're using plain tex.

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