[Imprint][Data Privacy Statement][E-Mail]

View long theorem info. View the proof. Back to main index. View the specification. View theorem base summary, View theorem base listing, the used properties by spec, the dependency list, the symbol table,

Proof step 2 from proof product-divide (previous step)

perm(ints, ints0 + ints1) ⊦ Π ints = Π ints0 * Π ints1

User applied rule structural induction

And obtained the following new goals

Proof step 3:
∀ ints0, ints1. perm(ints2, ints0 + ints1) → Π ints2 = Π ints0 * Π ints1, perm(i + ints2, ints0 + ints1) ⊦ Π(i + ints2) = Π ints0 * Π ints1

Rule argument

indvar: ints

Additional information

Used simplifier rules: prod-empty: ⊦ Π [] = 1;%intlist freely generated by [], +;;%empty-01: ⊦ perm([], ints) ↔ ints = []; from specification list-perm[intlista]%app-02-ant: ⊦ ¬ ints + ints0 ≠ [] ↔ ints = [] ∧ ints0 = []; from specification list[intlista]%a: ⊦ (ints + ints0) + ints1 = ints + ints0 + ints1; from specification list[intlista]%associativity: ⊦ i * j * j0 = (i * j) * j0; from specification int-mult%commutativity: ⊦ i * j = j * i; from specification int-mult