The complexity of computing the permanent. Theoretical Computer Science, 8:189–201 (1979)

by L G Valiant
Venue:w w ⎪⎨ ⎜ z1 ⎟ ⎜ z1 ⎟ u = ⎜ ⎟ ⎝ . ⎠ ; U = ⎜ ⎟ ⎝ ⎪⎩ . ⎠ : ||w|| ≤ γ, zi ⎫ ⎪⎬ ∈ Zi, ∀i