Theorem 2oneel 7474

Description: (/) and 1o are two unequal elements of 2o. (Contributed by Jim Kingdon, 8-Feb-2025.)

Assertion

Ref	Expression
2oneel	|- <. (/) , 1o >. e. { <. u , v >. | ( ( u e. 2o /\ v e. 2o ) /\ u =/= v ) }

Distinct variable group:   v, u

Proof of Theorem 2oneel

Step	Hyp	Ref	Expression
1		1n0 6599	. . 3 |- 1o =/= (/)
2	1	necomi 2487	. 2 |- (/) =/= 1o
3		0lt2o 6608	. . 3 |- (/) e. 2o
4		1lt2o 6609	. . 3 |- 1o e. 2o
5		neeq1 2415	. . . 4 |- ( u = (/) -> ( u =/= v <-> (/) =/= v ) )
6		neeq2 2416	. . . 4 |- ( v = 1o -> ( (/) =/= v <-> (/) =/= 1o ) )
7	5, 6	opelopab2 4365	. . 3 |- ( ( (/) e. 2o /\ 1o e. 2o ) -> ( <. (/) , 1o >. e. { <. u , v >. | ( ( u e. 2o /\ v e. 2o ) /\ u =/= v ) } <-> (/) =/= 1o ) )
8	3, 4, 7	mp2an 426	. 2 |- ( <. (/) , 1o >. e. { <. u , v >. | ( ( u e. 2o /\ v e. 2o ) /\ u =/= v ) } <-> (/) =/= 1o )
9	2, 8	mpbir 146	1 |- <. (/) , 1o >. e. { <. u , v >. | ( ( u e. 2o /\ v e. 2o ) /\ u =/= v ) }

Syntax hints:   /\ wa 104   <-> wb 105   e. wcel 2202   =/= wne 2402   (/)c0 3494   <.cop 3672   {copab 4149   1oc1o 6574   2oc2o 6575

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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-ral 2515  df-rex 2516  df-v 2804  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-opab 4151  df-tr 4188  df-iord 4463  df-on 4465  df-suc 4468  df-1o 6581  df-2o 6582

This theorem is referenced by:  2omotaplemst  7476