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Galois

Galois: A Language for Proofs Using Galois connections and ... - ALFA

Galois: A Language for Proofs Using Galois connections and ... - ALFA

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Theoretical background<br />

Point-free transform<br />

Point-free definitions<br />

Definition (<strong>Galois</strong> connection)<br />

Definition (Indirect equality)<br />

f ◦ ◦ ⊑ B = ⊑ A ◦ g<br />

f = g ⇔ ≼ ◦ f = ≼ ◦ g<br />

f = g ⇔ f ◦ ◦ ≼ = g ◦ ◦ ≼<br />

Paulo Silva (UMinho) <strong>Galois</strong> PLMMS’09 20 / 28

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