21 lines
1.2 KiB
Plaintext
21 lines
1.2 KiB
Plaintext
# Multiplication with positive numbers preserves the order of integers
|
|
axiom: forall N1, N2, N3 (N1 > N2 and N3 > 0 -> N1 * N3 > N2 * N3).
|
|
|
|
# Induction principle instantiated for p.
|
|
# This axiom is necessary because we use Vampire without higher-order reasoning
|
|
axiom: forall N1 (p(N1) and forall N2 (N2 >= N1 and not p(N2) -> not p(N2 + 1)) -> forall N2 (N2 >= N1 -> p(N2))).
|
|
#axiom: p(0) and forall N (N >= 0 and p(N) -> p(N + 1)) -> forall N p(N).
|
|
|
|
lemma(forward): forall X (p(X) <-> exists N (X = N and N >= 0 and N * N <= n)).
|
|
lemma(forward): forall X (q(X) <-> exists N2 (X = N2 and N2 >= 0 and N2 * N2 <= n and (N2 + 1) * (N2 + 1) > n)).
|
|
lemma(forward): forall N1, N2 (N1 >= 0 and N2 >= 0 and N1 < N2 -> N1 * N1 < N2 * N2).
|
|
lemma(forward): forall N (N >= 0 and p(N + 1) -> p(N)).
|
|
lemma(forward): not p(n + 1).
|
|
lemma(forward): forall N1, N2 (q(N1) and N2 > N1 -> not q(N2)).
|
|
lemma(forward): forall N (N >= 0 and not p(N + 1) -> (N + 1) * (N + 1) > n).
|
|
|
|
lemma(backward): forall N1, N2 (q(N1) and q(N2) -> N1 = N2).
|
|
axiom: forall N1, N2 (p(N1) and not p(N1 + 1) and p(N2) and not p(N2 + 1) -> N1 = N2).
|
|
|
|
lemma(backward): forall X1 (q(X1) -> p(X1) and exists X2 (exists N (X2 = N + 1 and N = X1) and not p(X2))).
|