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Proof step 2 from proof ubyte-neg (previous step)

b2i(by) < 0 ⊦ ub2i(by) = 256 + b2i(by)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ ub2i(by) = bits2int(false ' + fillsgn(8, int2bits(b2i(by))))
Proof step 4:
b2i(by) < 0 ⊦ bits2int(false ' + fillsgn(8, int2bits(b2i(by)))) = 256 + b2i(by)

Rule argument

name: unsigned-byte rotate: F subst: [by] → [by]

Additional information

Used terms: by