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Mathematics, 18.11.2020 03:20 carleygalloway103

Prove ⊢(x)(Fx ⊃ Gx) ⊃ (x)(¬Gx ⊃ ¬Fx)

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Prove ⊢(x)(Fx ⊃ Gx) ⊃ (x)(¬Gx ⊃ ¬Fx)...

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