Theorems · Definition · algebraic topology
homotopyGroupEquivFundamentalGroupOfUnique
{X : Type u_2} →
[inst : TopologicalSpace X] → {x : X} → (N : Type u_3) → [Unique N] → HomotopyGroup N X x ≃ FundamentalGroup X xThe homotopy group at x indexed by a singleton is in bijection with the fundamental group,
i.e. the loops based at x up to homotopy.
- Defined in
- Mathlib.Topology.Homotopy.HomotopyGroup
- Cited by
- 0 results in Mathlib
- Foundations
- Depth 162 from the axioms · uses propext, Classical.choice, Quot.sound
- Assumes
- TopologicalSpaceUnique
Around this declaration
Dashed lines are statement dependencies; solid lines are citations in proofs.
Cites9
Mathlib declarations this one mentions in its statement or cites explicitly in its proof. Plumbing is filtered out.
- TopologicalSpacestatement and proof · cited by 24,529
- Equivstatement · cited by 8,337
- Set.Elemproof · cited by 7,166
- Uniquestatement and proof · cited by 400
- GenLoopproof · cited by 44
- FundamentalGroupstatement · cited by 30
- HomotopyGroupstatement · cited by 7
- Quotient.congrproof · cited by 1
- genLoopEquivOfUniqueproof · cited by 1
Cited by2
Results whose statement or proof uses this declaration.
- HomotopyGroup.pi1EquivFundamentalGroupproof · cited by 0
- HomotopyGroup.homotopyGroupOfUniqueMulEquivFundamentalGroupproof · cited by 0