Theorem 2oneel 7612

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 6695	. . 3 |- 1o =/= (/)
2	1	necomi 2505	. 2 |- (/) =/= 1o
3		0lt2o 6704	. . 3 |- (/) e. 2o
4		1lt2o 6705	. . 3 |- 1o e. 2o
5		neeq1 2433	. . . 4 |- ( u = (/) -> ( u =/= v <-> (/) =/= v ) )
6		neeq2 2434	. . . 4 |- ( v = 1o -> ( (/) =/= v <-> (/) =/= 1o ) )
7	5, 6	opelopab2 4408	. . 3 |- ( ( (/) e. 2o /\ 1o e. 2o ) -> ( <. (/) , 1o >. e. { <. u , v >. | ( ( u e. 2o /\ v e. 2o ) /\ u =/= v ) } <-> (/) =/= 1o ) )
8	3, 4, 7	mp2an 430	. 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 2209   =/= wne 2420   (/)c0 3520   <.cop 3708   {copab 4186   1oc1o 6670   2oc2o 6671

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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-nul 4254  ax-pow 4306  ax-pr 4341  ax-un 4573

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-opab 4188  df-tr 4225  df-iord 4506  df-on 4508  df-suc 4511  df-1o 6677  df-2o 6678

This theorem is referenced by:  2omotaplemst  7614