Search for blocks/addresses/...
Proofgold Proof
pf
Apply Inj0_pair_0_eq with
λ x0 x1 :
ι → ι
.
∀ x2 x3 x4 .
x4
∈
x2
⟶
x0
x4
∈
setsum
x2
x3
.
The subproof is completed by applying Inj0_setsum.
■