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In the definition section, maybe talk about how when there's no fixed point and T is a point, a equivariant map P -> X is a genuine orbit (recall a principal bundle on a point is the group and equivariant map from the group is an orbit blah blah), and when these condition be dropped the points in the stack should be considered as "generalized orbits". This definition was indeed baffling when I first saw it. --Fourier-Deligne Transgirl (talk) 14:17, 19 December 2022 (UTC)[reply]
