Sandbox

The sandbox is the page where you can experiment with the wiki syntax. Feel free to write nonsense or clear the page whenever you want.

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Poincare complexes are great:

$\displaystyle H_i(X) \cong H^{n-i}(X)$ $$\displaystyle H_i(X) \cong H^{n-i}(X)$$

$\displaystyle \oplus, \bigoplus$ $$\displaystyle \oplus, \bigoplus$$