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- Thread starter Peter
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Capital Tau is just a T.

Mathjax doesn't have a caligraphic Tau, but the caligraphic T is the same thing: $\mathcal{T(S)}$.

Alternatively we can consider mathscr T: $\mathscr{T(S)}$.

I think that the T in your text is just a caligraphic T. It is just rendered slightly differently.

Note that a lowercase tau actually has its bottom curve in the opposite direction

although this is hardly visible in the mathjax version ($\tau$).