= Equivariant stable homotopy theory
{wiki=Equivariant_stable_homotopy_theory}
Equivariant stable homotopy theory is a branch of algebraic topology that studies the stable homotopy categories of topological spaces or spectra with a group action, particularly focusing on the actions of a compact Lie group or discrete group. The theory extends classical stable homotopy theory, which examines stable phenomena in topology, into the context where symmetry plays an important role.
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