Math Query: Troubleshooting \mathcal{\Tau_1}

[Math Amateur]

In a recent post I wanted to use a capital tau ... and so typed \mathcal{ \Tau_1 } but generated an error ...

Can someone please help ... ...
I wanted the capital tau symbol as in the following text ...
View attachment 9619
Hope someone can help ...

Peter

 

[I like Serena]

Hi Peter,

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
View attachment 9620
although this is hardly visible in the mathjax version ($\tau$).

 

[Prove It]

Try mathcal{T}, which gives $\displaystyle \mathcal{T}$.