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Theorem validx-def

⊦ validx ↔ (∀ ev. view(ev) = C → eqrel(ev, ev)) ∧ (∀ ev, ev0. view(ev) = C ∧ view(ev0) = C ∧ eqrel(ev, ev0) → eqrel(ev0, ev)) ∧ (∀ ev, ev0, ev1. view(ev) = C ∧ view(ev0) = C ∧ view(ev1) = C ∧ eqrel(ev, ev0) ∧ eqrel(ev0, ev1) → eqrel(ev, ev1)) ∧ (∀ ev, ev0. view(ev) = C ∧ eqrel(ev, ev0) → view(ev0) = C) ∧ (∀ ev, ev0. view(ev0) = C ∧ eqrel(ev, ev0) → view(ev) = C)