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Theorem mod-square-10

⊦ (i * i) % 10 = 0 ↔ i % 10 = 0

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 12
Proof steps: 20
Used lemmas: div-not-ls, prime-5, divides, prime-divides, prime-two-01, prime-mult-eq,
Used spec theorems:
- int-div/modex
Used simplifier rules: