[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 23 from proof bitsand-cast-04 (previous step)

# bits1 < # bits0, # bits1 ≤ # bits0 + n0 ⊦ sgn(bitsand(mklist(boolvar, n0) + boolvar ' + bits0, false ' + bits1)) = sgn(bitsand(boolvar ' + bits0, false ' + bits1)), n0 = 0, # bits1 = # bits0, bits0 = []

User applied rule insert spec-lemma

And obtained the following new goals

Proof step 24:
n ≤ # bits ⊦ ∃ bits0, bits1. bits = bits0 + bits1 ∧ # bits1 = n
Proof step 25:
∃ bits3, bits2. bits0 = bits3 + bits2 ∧ # bits2 = 1 + # bits1, # bits1 < # bits0, # bits1 ≤ # bits0 + n0 ⊦ sgn(bitsand(mklist(boolvar, n0) + boolvar ' + bits0, false ' + bits1)) = sgn(bitsand(boolvar ' + bits0, false ' + bits1)), n0 = 0, # bits1 = # bits0, bits0 = []

Rule argument

seq: n ≤ # bits ⊦ ∃ bits0, bits1. bits = bits0 + bits1 ∧ # bits1 = n subst: [n, bits] → [1 + # bits1, bits0] rotate: F spec: list inst: bitlista name: split-rest

Additional information

Used simplifier rules: ⊦ m + 1 ≤ n ↔ m < n;% ⊦ m ≠ n → (¬ m < n ↔ n < m);% ⊦ m < n → ¬ n < m;% ⊦ (m + n0) + n1 = m + n0 + n1;% ⊦ m + n = n + m; Used terms: 1 + # bits1, bits0