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Proof step 14 from proof band-bitlength (previous step)

# int2bits(i) < # sgn(bitsand(int2bits(j), int2bits(i))), # int2bits(i) < # bitsand(int2bits(j), int2bits(i)), # int2bits(j) < # sgn(bitsand(int2bits(j), int2bits(i))), # int2bits(j) < # bitsand(int2bits(j), int2bits(i)), # int2bits(i) < n, # int2bits(j) < n, n ≤ # sgn(bitsand(int2bits(j), int2bits(i))), n ≤ # bitsand(int2bits(j), int2bits(i)), # int2bits(i) ≤ # int2bits(j), i < 0 ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 15:
⊦ bits0.first ∧ # bits0 ≤ # bits ∧ bits0 ≠ [] → # bitsand(bits, bits0) = # bits

Rule argument

name: bitsand-len-true rotate: F subst: [bits0, bits] → [int2bits(i), int2bits(j)]

Additional information

Used simplifier rules: ⊦ ¬ n < n;% ⊦ j < 0 → int2bits(j).first;% ⊦ ¬ m ≤ n ↔ n < m;% ⊦ m ≤ n → (n < m ↔ false);% ⊦ int2bits(j) ≠ []; Used terms: int2bits(i), int2bits(j)