fintype instances for sigma types #
instance
PSigma.instFintype
{ι : Type u_1}
{κ : ι → Type u_5}
[(i : ι) → Fintype (κ i)]
[Fintype ι]
:
Fintype ((i : ι) ×' κ i)
Equations
- PSigma.instFintype = Fintype.ofEquiv ((i : ι) × κ i) (Equiv.psigmaEquivSigma fun (i : ι) => κ i).symm