Theorem ferison 2711

Description: "Ferison", one of the syllogisms of Aristotelian logic. No 𝜑 is 𝜓, and some 𝜑 is 𝜒, therefore some 𝜒 is not 𝜓. Instance of datisi 2709. In Aristotelian notation, EIO-3: MeP and MiS therefore SoP. (Contributed by David A. Wheeler, 28-Aug-2016.)

Hypotheses

Ref	Expression
ferison.maj	⊢ ∀𝑥(𝜑 → ¬ 𝜓)
ferison.min	⊢ ∃𝑥(𝜑 ∧ 𝜒)

Assertion

Ref	Expression
ferison	⊢ ∃𝑥(𝜒 ∧ ¬ 𝜓)

Proof of Theorem ferison

Step	Hyp	Ref	Expression
1		ferison.maj	. 2 ⊢ ∀𝑥(𝜑 → ¬ 𝜓)
2		ferison.min	. 2 ⊢ ∃𝑥(𝜑 ∧ 𝜒)
3	1, 2	datisi 2709	1 ⊢ ∃𝑥(𝜒 ∧ ¬ 𝜓)

This proof depends on syntax axioms:  ¬ wn 3   → wi 4   ∧ wa 401  ∀wal 1568  ∃wex 1812

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842

This proof depends on definitions:  df-bi 210  df-an 402  df-ex 1813

This theorem is used by: (None)