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Proof step 3 from proof num-i2l-neg (previous step)

i < ~9223372036854775808, i < 0 ⊦ i2l(i) = i2l(bits2int(lastn(64, int2bits(i))))

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ i2l(i) = i2l(cast(64, i))
Proof step 5:
i < ~9223372036854775808, i < 0 ⊦ i2l(cast(64, i)) = i2l(bits2int(lastn(64, int2bits(i))))

Rule argument

name: long-is-cast-01 rotate: F subst: [i] → [i]

Additional information

Used terms: i