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Reference.org
Spherical space form conjecture
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<p>In <a href="/facts/Geometric_topology/NpsqSK2N">geometric topology</a>, the spherical space form conjecture (now a theorem) states that a <a href="/facts/Finite_group/vv2tvogB">finite group</a> acting on the <a href="/facts/3-sphere/u67nImpY">3-sphere</a> is conjugate to a <a href="/facts/Group_of_isometries/K5wX8ah6">group of isometries</a> of the 3-sphere. </p>