Theorem camestros 2312

Description: "Camestros", one of the syllogisms of Aristotelian logic. All ph is ps, no ch is ps, and ch exist, therefore some ch is not ph. (In Aristotelian notation, AEO-2: PaM and SeM therefore SoP.) For example, "All horses have hooves", "No humans have hooves", and humans exist, therefore "Some humans are not horses". (Contributed by David A. Wheeler, 28-Aug-2016.) (Revised by David A. Wheeler, 2-Sep-2016.)

Hypotheses

Ref	Expression
camestros.maj	|- A.x(ph -> ps)
camestros.min	|- A.x(ch -> -. ps)
camestros.e	|- E.xch

Assertion

Ref	Expression
camestros	|- E.x(ch /\ -. ph)

Proof of Theorem camestros

Step	Hyp	Ref	Expression
1		camestros.e	. 2 |- E.xch
2		camestros.min	. . . . . 6 |- A.x(ch -> -. ps)
3	2	spi 1753	. . . . 5 |- (ch -> -. ps)
4		camestros.maj	. . . . . 6 |- A.x(ph -> ps)
5	4	spi 1753	. . . . 5 |- (ph -> ps)
6	3, 5	nsyl 113	. . . 4 |- (ch -> -. ph)
7	6	ancli 534	. . 3 |- (ch -> (ch /\ -. ph))
8	7	eximi 1576	. 2 |- (E.xch -> E.x(ch /\ -. ph))
9	1, 8	ax-mp 5	1 |- E.x(ch /\ -. ph)

Syntax hints:  -. wn 3   -> wi 4   /\ wa 358  A.wal 1540  E.wex 1541

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-11 1746

This theorem depends on definitions:  df-bi 177  df-an 360  df-ex 1542

This theorem is referenced by: (None)