Theorem tridceq 15787

Description: Real trichotomy implies decidability of real number equality. Or in other words, analytic LPO implies analytic WLPO (see trilpo 15774 and redcwlpo 15786). Thus, this is an analytic analogue to lpowlpo 7243. (Contributed by Jim Kingdon, 24-Jul-2024.)

Assertion

Ref	Expression
tridceq	|- ( A. x e. RR A. y e. RR ( x < y \/ x = y \/ y < x ) -> A. x e. RR A. y e. RR DECID x = y )

Distinct variable group:   x, y

Proof of Theorem tridceq

Step	Hyp	Ref	Expression
1		ltne 8128	. . . . . . 7 |- ( ( x e. RR /\ x < y ) -> y =/= x )
2	1	ex 115	. . . . . 6 |- ( x e. RR -> ( x < y -> y =/= x ) )
3	2	adantr 276	. . . . 5 |- ( ( x e. RR /\ y e. RR ) -> ( x < y -> y =/= x ) )
4		olc 712	. . . . . 6 |- ( x =/= y -> ( x = y \/ x =/= y ) )
5		necom 2451	. . . . . 6 |- ( y =/= x <-> x =/= y )
6		dcne 2378	. . . . . 6 |- (DECID x = y <-> ( x = y \/ x =/= y ) )
7	4, 5, 6	3imtr4i 201	. . . . 5 |- ( y =/= x -> DECID x = y )
8	3, 7	syl6 33	. . . 4 |- ( ( x e. RR /\ y e. RR ) -> ( x < y -> DECID x = y ) )
9		orc 713	. . . . . 6 |- ( x = y -> ( x = y \/ x =/= y ) )
10	9, 6	sylibr 134	. . . . 5 |- ( x = y -> DECID x = y )
11	10	a1i 9	. . . 4 |- ( ( x e. RR /\ y e. RR ) -> ( x = y -> DECID x = y ) )
12		ltne 8128	. . . . . . 7 |- ( ( y e. RR /\ y < x ) -> x =/= y )
13	12	ex 115	. . . . . 6 |- ( y e. RR -> ( y < x -> x =/= y ) )
14	13	adantl 277	. . . . 5 |- ( ( x e. RR /\ y e. RR ) -> ( y < x -> x =/= y ) )
15	4, 6	sylibr 134	. . . . 5 |- ( x =/= y -> DECID x = y )
16	14, 15	syl6 33	. . . 4 |- ( ( x e. RR /\ y e. RR ) -> ( y < x -> DECID x = y ) )
17	8, 11, 16	3jaod 1315	. . 3 |- ( ( x e. RR /\ y e. RR ) -> ( ( x < y \/ x = y \/ y < x ) -> DECID x = y ) )
18	17	ralimdva 2564	. 2 |- ( x e. RR -> ( A. y e. RR ( x < y \/ x = y \/ y < x ) -> A. y e. RR DECID x = y ) )
19	18	ralimia 2558	1 |- ( A. x e. RR A. y e. RR ( x < y \/ x = y \/ y < x ) -> A. x e. RR A. y e. RR DECID x = y )

Syntax hints:   -> wi 4   /\ wa 104   \/ wo 709  DECID wdc 835   \/ w3o 979   e. wcel 2167   =/= wne 2367   A.wral 2475   class class class wbr 4034   RRcr 7895   < clt 8078

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243  ax-un 4469  ax-setind 4574  ax-cnex 7987  ax-resscn 7988  ax-pre-ltirr 8008

This theorem depends on definitions:  df-bi 117  df-dc 836  df-3or 981  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ne 2368  df-nel 2463  df-ral 2480  df-rex 2481  df-rab 2484  df-v 2765  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-uni 3841  df-br 4035  df-opab 4096  df-xp 4670  df-pnf 8080  df-mnf 8081  df-ltxr 8083

This theorem is referenced by:  dcapnconstALT  15793