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Higher Topos Theory Section 2.2: Effective epimorphisms

Groupoid colimits in topoi

Corollary 2.23.

Groupoid colimits are effective in a topos.

Section 2.2

Effective epimorphisms

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Definition 2.21 Effective groupoid colimits
Lemma 2.22 Descent for groupoid colimits
Corollary 2.23 Groupoid colimits in topoi
Construction 2.24 The Čech nerve
Notation 2.25 The augmented Čech nerve

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