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Theorem Even
⊦ even(n) ↔ (∃ m. m + m = n)
Type: An axiom
Validity: The proof is valid.
Features: localsimp,
Comment:
Used by:
div2-elim-01
,
div2-even
,
div2-odd
,
div2-odd-01
,
eo
,
eo-01
,
eo-02
,
even-add
,
even-div2
,
even-mult
,
odd
,
odd-add
,
odd-mult
,
oe
,
oe-01
,
oe-02
,
oex
,
one
,
otwo-02
,
plus
,
pot2-even-02
,
two-02
,
two-03
,
zero
,
zero-01
,
zero-02
,
Used by units in proved state:
Proof exists?: No