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$Write here... <wikitex>; $\text{\sf{frog}}$ </wikitex> <wikitex>; Poincare complexes are great: $$ H_i(X) \cong H^{n-i}(X)$$ $$ \oplus, \bigoplus $$ </wikitex>Write here... <wikitex>; $\text{\sf{frog}}$ </wikitex> <wikitex>; Poincare complexes are great: $$ H_i(X) \cong H^{n-i}(X)$$ $$ \oplus, \bigoplus $$ </wikitex>\stackrel{CW^2}{\xrightarrow{\hspace*{0.75cm}}}$

Poincare complexes are great:

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

$$\displaystyle \oplus, \bigoplus$$