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TikZ test

This method is reused.

TODO

  • Automate the generation of TikZ diagrams.

  • Add counter to TikZ diagrams.

Demo

Similarly, we can construct the second cohomology of Lie algebras for classifying central extensions. An exact sequence of Lie algebras

is call a central extension if \(\lie{a}\) is abelian and \([\lie{a},\lie{b}]=0\).