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Theorem darapti 2015
 Description: "Darapti", one of the syllogisms of Aristotelian logic. All 𝜑 is 𝜓, all 𝜑 is 𝜒, and some 𝜑 exist, therefore some 𝜒 is 𝜓. (In Aristotelian notation, AAI-3: MaP and MaS therefore SiP.) For example, "All squares are rectangles" and "All squares are rhombuses", therefore "Some rhombuses are rectangles". (Contributed by David A. Wheeler, 28-Aug-2016.)
Hypotheses
Ref Expression
darapti.maj 𝑥(𝜑𝜓)
darapti.min 𝑥(𝜑𝜒)
darapti.e 𝑥𝜑
Assertion
Ref Expression
darapti 𝑥(𝜒𝜓)

Proof of Theorem darapti
StepHypRef Expression
1 darapti.e . 2 𝑥𝜑
2 darapti.min . . . 4 𝑥(𝜑𝜒)
32spi 1429 . . 3 (𝜑𝜒)
4 darapti.maj . . . 4 𝑥(𝜑𝜓)
54spi 1429 . . 3 (𝜑𝜓)
63, 5jca 290 . 2 (𝜑 → (𝜒𝜓))
71, 6eximii 1493 1 𝑥(𝜒𝜓)
 Colors of variables: wff set class Syntax hints:   → wi 4   ∧ wa 97  ∀wal 1241  ∃wex 1381 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1336  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-4 1400  ax-ial 1427 This theorem depends on definitions:  df-bi 110 This theorem is referenced by: (None)
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