Finset.card

{α : Type u_1} → Finset α → ℕ

s.card is the number of elements of s, aka its cardinality. The notation #s can be accessed in the Finset locale.

Defined in: Mathlib.Data.Finset.Card
Cited by: 2,327 results in Mathlib
Foundations: Depth 12 from the axioms, rests on 47 definitions · uses propext

Around this declaration

Dashed lines are statement dependencies; solid lines are citations in proofs.

Mathlib declarations this one mentions in its statement or cites explicitly in its proof. Plumbing is filtered out.

Results whose statement or proof uses this declaration.

Showing the 200 most cited of 2,455.