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Proof step 9 from proof even-add (previous step)

2 * m0 = m + 2 * m2 ⊦ ∃ m0. 2 * m0 = m

User applied rule exists right

And obtained the following new goals

Proof step 10:
2 * m0 = m + 2 * m2 ⊦ 2 * (m0 - m2) = m

Rule argument

pos: right 1 terms: m0 - m2 abort: F discard: T computed: F

Additional information

Used terms: m0 - m2