Theorem ordtri3or 2985

Description: A trichotomy law for ordinals. Proposition 7.10 of [TakeutiZaring] p. 38.

Assertion

Ref	Expression
ordtri3or	|- ((Ord A /\ Ord B) -> (A e. B \/ A = B \/ B e. A))

Proof of Theorem ordtri3or

Step	Hyp	Ref	Expression
1		ordin 2983	. . . . . 6 |- ((Ord A /\ Ord B) -> Ord (A i^i B))
2		ordirr 2972	. . . . . 6 |- (Ord (A i^i B) -> -. (A i^i B) e. (A i^i B))
3	1, 2	syl 10	. . . . 5 |- ((Ord A /\ Ord B) -> -. (A i^i B) e. (A i^i B))
4		elin 2210	. . . . . . . 8 |- ((A i^i B) e. (A i^i B) <-> ((A i^i B) e. A /\ (A i^i B) e. B))
5		incom 2211	. . . . . . . . . 10 |- (A i^i B) = (B i^i A)
6	5	eleq1i 1540	. . . . . . . . 9 |- ((A i^i B) e. B <-> (B i^i A) e. B)
7	6	anbi2i 482	. . . . . . . 8 |- (((A i^i B) e. A /\ (A i^i B) e. B) <-> ((A i^i B) e. A /\ (B i^i A) e. B))
8	4, 7	bitr 173	. . . . . . 7 |- ((A i^i B) e. (A i^i B) <-> ((A i^i B) e. A /\ (B i^i A) e. B))
9	8	negbii 187	. . . . . 6 |- (-. (A i^i B) e. (A i^i B) <-> -. ((A i^i B) e. A /\ (B i^i A) e. B))
10		ianor 305	. . . . . 6 |- (-. ((A i^i B) e. A /\ (B i^i A) e. B) <-> (-. (A i^i B) e. A \/ -. (B i^i A) e. B))
11	9, 10	bitr 173	. . . . 5 |- (-. (A i^i B) e. (A i^i B) <-> (-. (A i^i B) e. A \/ -. (B i^i A) e. B))
12	3, 11	sylib 198	. . . 4 |- ((Ord A /\ Ord B) -> (-. (A i^i B) e. A \/ -. (B i^i A) e. B))
13		inss1 2233	. . . . . . . . . 10 |- (A i^i B) (_ A
14		ordsseleq 2982	. . . . . . . . . 10 |- ((Ord (A i^i B) /\ Ord A) -> ((A i^i B) (_ A <-> ((A i^i B) e. A \/ (A i^i B) = A)))
15	13, 14	mpbii 193	. . . . . . . . 9 |- ((Ord (A i^i B) /\ Ord A) -> ((A i^i B) e. A \/ (A i^i B) = A))
16	15, 1	sylan 450	. . . . . . . 8 |- (((Ord A /\ Ord B) /\ Ord A) -> ((A i^i B) e. A \/ (A i^i B) = A))
17	16	anabss1 501	. . . . . . 7 |- ((Ord A /\ Ord B) -> ((A i^i B) e. A \/ (A i^i B) = A))
18	17	ord 232	. . . . . 6 |- ((Ord A /\ Ord B) -> (-. (A i^i B) e. A -> (A i^i B) = A))
19		df-ss 2056	. . . . . 6 |- (A (_ B <-> (A i^i B) = A)
20	18, 19	syl6ibr 213	. . . . 5 |- ((Ord A /\ Ord B) -> (-. (A i^i B) e. A -> A (_ B))
21		inss1 2233	. . . . . . . . . 10 |- (B i^i A) (_ B
22		ordsseleq 2982	. . . . . . . . . 10 |- ((Ord (B i^i A) /\ Ord B) -> ((B i^i A) (_ B <-> ((B i^i A) e. B \/ (B i^i A) = B)))
23	21, 22	mpbii 193	. . . . . . . . 9 |- ((Ord (B i^i A) /\ Ord B) -> ((B i^i A) e. B \/ (B i^i A) = B))
24		ordin 2983	. . . . . . . . 9 |- ((Ord B /\ Ord A) -> Ord (B i^i A))
25	23, 24	sylan 450	. . . . . . . 8 |- (((Ord B /\ Ord A) /\ Ord B) -> ((B i^i A) e. B \/ (B i^i A) = B))
26	25	anabss4 503	. . . . . . 7 |- ((Ord A /\ Ord B) -> ((B i^i A) e. B \/ (B i^i A) = B))
27	26	ord 232	. . . . . 6 |- ((Ord A /\ Ord B) -> (-. (B i^i A) e. B -> (B i^i A) = B))
28		df-ss 2056	. . . . . 6 |- (B (_ A <-> (B i^i A) = B)
29	27, 28	syl6ibr 213	. . . . 5 |- ((Ord A /\ Ord B) -> (-. (B i^i A) e. B -> B (_ A))
30	20, 29	orim12d 567	. . . 4 |- ((Ord A /\ Ord B) -> ((-. (A i^i B) e. A \/ -. (B i^i A) e. B) -> (A (_ B \/ B (_ A)))
31	12, 30	mpd 26	. . 3 |- ((Ord A /\ Ord B) -> (A (_ B \/ B (_ A))
32		ordsseleq 2982	. . . 4 |- ((Ord A /\ Ord B) -> (A (_ B <-> (A e. B \/ A = B)))
33		ordsseleq 2982	. . . . 5 |- ((Ord B /\ Ord A) -> (B (_ A <-> (B e. A \/ B = A)))
34	33	ancoms 438	. . . 4 |- ((Ord A /\ Ord B) -> (B (_ A <-> (B e. A \/ B = A)))
35	32, 34	orbi12d 629	. . 3 |- ((Ord A /\ Ord B) -> ((A (_ B \/ B (_ A) <-> ((A e. B \/ A = B) \/ (B e. A \/ B = A))))
36	31, 35	mpbid 195	. 2 |- ((Ord A /\ Ord B) -> ((A e. B \/ A = B) \/ (B e. A \/ B = A)))
37		df-3or 778	. . . 4 |- ((A e. B \/ A = B \/ B e. A) <-> ((A e. B \/ A = B) \/ B e. A))
38		or23 263	. . . 4 |- (((A e. B \/ A = B) \/ B e. A) <-> ((A e. B \/ B e. A) \/ A = B))
39	37, 38	bitr 173	. . 3 |- ((A e. B \/ A = B \/ B e. A) <-> ((A e. B \/ B e. A) \/ A = B))
40		orordir 267	. . 3 |- (((A e. B \/ B e. A) \/ A = B) <-> ((A e. B \/ A = B) \/ (B e. A \/ A = B)))
41		eqcom 1480	. . . . 5 |- (A = B <-> B = A)
42	41	orbi2i 255	. . . 4 |- ((B e. A \/ A = B) <-> (B e. A \/ B = A))
43	42	orbi2i 255	. . 3 |- (((A e. B \/ A = B) \/ (B e. A \/ A = B)) <-> ((A e. B \/ A = B) \/ (B e. A \/ B = A)))
44	39, 40, 43	3bitr 177	. 2 |- ((A e. B \/ A = B \/ B e. A) <-> ((A e. B \/ A = B) \/ (B e. A \/ B = A)))
45	36, 44	sylibr 200	1 |- ((Ord A /\ Ord B) -> (A e. B \/ A = B \/ B e. A))

Syntax hints:  -. wn 2   -> wi 3   <-> wb 146   \/ wo 222   /\ wa 223   \/ w3o 776   = wceq 958   e. wcel 960   i^i cin 2049   (_ wss 2050  Ord word 2953

This theorem is referenced by:  ordtri1 2986  ordtri3 2989  ordon 2993  ordeleqon 2996  ordtri2or 3083  zorn2lem6 4803

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 964  ax-gen 965  ax-8 966  ax-10 968  ax-11 969  ax-12 970  ax-13 971  ax-14 972  ax-17 973  ax-4 975  ax-5o 977  ax-6o 980  ax-9o 1125  ax-10o 1142  ax-16 1212  ax-11o 1220  ax-ext 1462  ax-sep 2708  ax-pow 2748  ax-pr 2785

This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-3or 778  df-3an 779  df-ex 983  df-sb 1174  df-eu 1384  df-mo 1385  df-clab 1467  df-cleq 1472  df-clel 1475  df-ne 1590  df-ral 1652  df-rex 1653  df-v 1815  df-dif 2052  df-un 2053  df-in 2054  df-ss 2056  df-nul 2284  df-pw 2406  df-sn 2416  df-pr 2417  df-op 2420  df-uni 2508  df-br 2625  df-opab 2672  df-tr 2686  df-eprel 2838  df-po 2846  df-so 2856  df-fr 2923  df-we 2940  df-ord 2957

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