[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 20 from proof sgn-one-01 (previous step)

sgn(boolvar ' + bits0) = false ', sgn(bits0) = false ' ∧ true ∈ bits0 → bits0 = [] ⊦ ¬ true ∈ bits0 ∧ ¬ boolvar

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 21:
bits ≠ [], bits.first ↔ boolvar ⊦ sgn(boolvar ' + bits) = sgn(bits)
Proof step 22:
¬(bits0 ≠ [] ∧ (bits0.first ↔ boolvar)), sgn(boolvar ' + bits0) = false ', sgn(bits0) = false ' ∧ true ∈ bits0 → bits0 = [] ⊦ ¬ true ∈ bits0 ∧ ¬ boolvar
Proof step 29:
bits0 ≠ [] ∧ (bits0.first ↔ boolvar), sgn(bits0) = false ', sgn(bits0) = false ' ∧ true ∈ bits0 → bits0 = [] ⊦ ¬ true ∈ bits0 ∧ ¬ boolvar

Rule argument

name: sgn-rec-01 rotate: F subst: [bits, boolvar] → [bits0, boolvar]

Additional information

Used terms: bits0, boolvar