« first day (1766 days earlier)   

12:16 AM
@egreg: Juve bought Hernanes!
@Werner Yay!
 
 
2 hours later…
2:20 AM
Hello!! When I use the command \begin{split} inside the command \begin{itemize} I get an error... Why? Can we not use it there?
The command I wrote is the following:
\begin{description}
\item $\begin{split}+ \ \ : \ \  x_1+x_2 &= a_1+b_1\sqrt{t^2-1}+a_2+b_2\sqrt{t^2-1}=(a_1+a_2)+(b_1+b_2)\sqrt{t^2-1} \\ & \mapsto (a_1+a_2, b_1+b_2)\end{split}$
\item $0\ \  : \ \  0=0+0 \sqrt{t^2-1} \mapsto (0,0)$
\end{description}
Have I done something wrong?
 
2:56 AM
Do you have an idea @egreg ?
 

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