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Proof step 77 from proof bitsand-cast (previous step)

sgn(mklist(boolvar, n0 - 1) + boolvar ' + boolvar0 ' + bits1) = boolvar ' + boolvar0 ' + bits1, n = # fillsgn(n, mklist(boolvar, n0 - 1) + boolvar ' + boolvar0 ' + bits1), n0 + 1 + # bits1 < (n0 - 1) + # bitsand(boolvar ' + boolvar0 ' + bits1, bits0), # bits0 ≤ 2 + # bits1, bits0.first, n0 + 1 + # bits1 < n, n ≤ (n0 - 1) + # bitsand(boolvar ' + boolvar0 ' + bits1, bits0), # bitsand(boolvar ' + boolvar0 ' + bits1, bits0) < n ⊦ n0 = 0, boolvar ↔ boolvar0, bits0 = [], n0 - 1 = 0, mklist(boolvar, n - # bitsand(boolvar ' + boolvar0 ' + bits1, bits0)) + bitsand(boolvar ' + boolvar0 ' + bits1, bits0) = lastn(n, mklist(boolvar, n0 - 1) + bitsand(boolvar ' + boolvar0 ' + bits1, bits0)), boolvar ∧ boolvar0

User applied rule insert elim lemma

And obtained the following new goals

Proof step 78:
n0 = m + 1, sgn(mklist(boolvar, m) + boolvar ' + boolvar0 ' + bits1) = boolvar ' + boolvar0 ' + bits1, n = # fillsgn(n, mklist(boolvar, m) + boolvar ' + boolvar0 ' + bits1), n0 + 1 + # bits1 < m + # bitsand(boolvar ' + boolvar0 ' + bits1, bits0), # bits0 ≤ 2 + # bits1, bits0.first, n0 + 1 + # bits1 < n, n ≤ m + # bitsand(boolvar ' + boolvar0 ' + bits1, bits0), # bitsand(boolvar ' + boolvar0 ' + bits1, bits0) < n ⊦ n0 = 0, boolvar ↔ boolvar0, bits0 = [], m = 0, mklist(boolvar, n - # bitsand(boolvar ' + boolvar0 ' + bits1, bits0)) + bitsand(boolvar ' + boolvar0 ' + bits1, bits0) = lastn(n, mklist(boolvar, m) + bitsand(boolvar ' + boolvar0 ' + bits1, bits0)), boolvar ∧ boolvar0

Rule argument

seq: n ≠ 0 ⊦ m = n - 1 ↔ n = m + 1 subst: [n, m] → [n0, m] rotate: T spec: nat inst: name: elim-pred-c

Additional information

Used simplifier rules: n ≠ 0 ⊦ m = n - 1 ↔ n = m + 1; (elim) Used terms: n0, m