[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 30 from proof rightshift-8-02 (previous step)

# int2bytes(i) = 1, i < 0, i < ~128 ⊦ i >> 8 = bytes2int((i2b(~1) ' + int2bytes(i)).butlast)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 31:
⊦ bytes ≠ [] → (by ' + bytes).butlast = by ' + bytes.butlast
Proof step 32:
int2bytes(i) ≠ [], # int2bytes(i) = 1, i < 0, i < ~128 ⊦ i >> 8 = bytes2int(i2b(~1) ' + int2bytes(i).butlast)

Rule argument

seq: ⊦ bytes ≠ [] → (by ' + bytes).butlast = by ' + bytes.butlast subst: [bytes, by] → [int2bytes(i), i2b(~1)] rotate: F spec: list-last inst: bytelist name: bc

Additional information

Used simplifier rules: int2bytes-empty: ⊦ int2bytes(i) ≠ []; Used terms: int2bytes(i), i2b(~1)