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Proof step 2 from proof byte-length (previous step)

8 < # int2bits(b2i(by)) ⊦ b2i(by) = ~128

User applied rule insert lemma

And obtained the following new goals

Proof step 3:
⊦ ~128 ≤ b2i(by) ∧ b2i(by) ≤ 127
Proof step 4:
~128 ≤ b2i(by) ∧ b2i(by) ≤ 127, 8 < # int2bits(b2i(by)) ⊦ b2i(by) = ~128

Rule argument

name: byte-range subst: [by] → [by]

Additional information

Used terms: by