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Proof step 4 from proof issi-ubyte (previous step)

0 < ub2i(by), ~32768 ≤ ub2i(by), 32767 < ub2i(by) ⊦

User applied rule cut formula

And closed the goal!

Rule argument

fma: ub2i(by) < 256

Additional information

Used simplifier rules: ubyte-max-01: ⊦ ¬ 256 ≤ ub2i(by);% ⊦ i < j ∧ ¬ i0 < j → ¬ i0 < i;% ⊦ ¬ i < j ↔ j ≤ i; Used formulas: ub2i(by) < 256