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The connected sum of

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$\newcommand{\bZ}{\mathbb{Z}} \newcommand{\bR}{\mathbb{R}} \newcommand{\bC}{\mathbb{C}} \newcommand{\bH}{\mathbb{H}} \newcommand{\bQ}{\mathbb{Q}} \newcommand{\bF}{\mathbb{F}} \newcommand{\bN}{\mathbb{N}} \DeclareMathOperator\id{id} % identity map \DeclareMathOperator\Sq{Sq} % Steenrod squares \DeclareMathOperator\Homeo{Homeo} % group of homeomorphisms of a topoloical space \DeclareMathOperator\Diff{Diff} % group of diffeomorphisms of a smooth manifold \DeclareMathOperator\SDiff{SDiff} % diffeomorphism under some constraint \DeclareMathOperator\Hom{Hom} % homomrphism group \DeclareMathOperator\End{End} % endomorphism group \DeclareMathOperator\Aut{Aut} % automorphism group \DeclareMathOperator\Inn{Inn} % inner automorphisms \DeclareMathOperator\Out{Out} % outer automorphism group \DeclareMathOperator\vol{vol} % volume \DeclareMathOrd\GL{GL} % general linear group \DeclareMathOrd\SL{SL} % special linear group \DeclareMathOrd\SO{SO} % special orthogonal group \DeclareMathOrd\SU{SU} % special unitary group \DeclareMathOrd\Spin{Spin} % Spin group \DeclareMathOrd\RP{\Rr\mathrm P} % real projective space \DeclareMathOrd\CP{\Cc\mathrm P} % complex projective space \DeclareMathOrd\HP{\Hh\mathrm P} % quaternionic projective space \DeclareMathOrd\Top{\mathrm{Top}} % topological category \DeclareMathOrd\PL{\mathrm{PL}} % piecewise linear category \DeclareMathOrd\Cat{\mathrm{Cat}} % any category \DeclareMathOrd\KS{KS} % Kirby-Siebenmann class \DeclareMathOrd\Hud{Hud} % Hudson torus%<nowiki> \newcommand{\Z}{\mathbb{Z}} \newcommand{\ra}{\rightarrow} \newcommand{\R}{\mathbb{R}} \newcommand{\Der}{\text{Der}} \newcommand{\cO}{\mathcal{O}} \newcommand{\SMan}{\text{SM}} \newcommand{\Nil}{\text{Nil}} \newcommand{\into}{\hookrightarrow} \newcommand{\BM}{\text{BunMan}} \newcommand{\C}{\mathbb{C}} \newcommand{\Alg}{\text{Alg}} \newcommand{\Man}{\text{Man}} \newcommand{\Sset}{\text{Set}} \newcommand{\Fun}{\text{Fun}} \newcommand{\Group}{\text{Group}} \newcommand{\fg}{\mathfrak{g}} \newcommand{\Vect}{\text{Vect}} \newcommand{\pt}{\text{pt}} %</nowiki>\RP^2$ with

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$T^2$ is homeomorphic to

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$\RP^2\mathbin{\sharp}\RP^2\mathbin{\sharp}\RP^2$.

The connected sum of

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$\RP^2$ with

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$T^2$ is homeomorphic to

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$\RP^2\mathbin{\sharp}\RP^2\mathbin{\sharp}\RP^2$.

The connected sum of

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$\RP^2$ with

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$T^2$ is homeomorphic to

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$\RP^2\mathbin{\sharp}\RP^2\mathbin{\sharp}\RP^2$.

The connected sum of

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$\RP^2$ with

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$T^2$ is homeomorphic to

Tex syntax error

$\RP^2\mathbin{\sharp}\RP^2\mathbin{\sharp}\RP^2$.

The connected sum of $\RP^2/var/www/vhost/map.mpim-bonn.mpg.de/tmp/AppWikiTex/tex_xA7gHj$$\RP^2$ with $T^2/var/www/vhost/map.mpim-bonn.mpg.de/tmp/AppWikiTex/tex_kcx936$$T^2$ is homeomorphic to $\RP^2\mathbin{\sharp}\RP^2\mathbin{\sharp}\RP^2/var/www/vhost/map.mpim-bonn.mpg.de/tmp/AppWikiTex/tex_PWsYcV$$\RP^2\mathbin{\sharp}\RP^2\mathbin{\sharp}\RP^2$.

2 Section

2.1 Subsection

Refert to subsection 2.1

Theorem 2.1. test

Refer to theorem 2.1

3 Section

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An inter-Wiki link.

Another; inter-Wiki link.

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Template:Ref Poincare complexes are great:

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

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