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Mirrors > Home > ILE Home > Th. List > pr2ne | Unicode version |
Description: If an unordered pair has two elements they are different. (Contributed by FL, 14-Feb-2010.) |
Ref | Expression |
---|---|
pr2ne |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | preq2 3596 | . . . . 5 | |
2 | 1 | eqcoms 2140 | . . . 4 |
3 | enpr1g 6685 | . . . . . 6 | |
4 | 3 | adantr 274 | . . . . 5 |
5 | prexg 4128 | . . . . . . 7 | |
6 | eqeng 6653 | . . . . . . 7 | |
7 | 5, 6 | syl 14 | . . . . . 6 |
8 | entr 6671 | . . . . . . . . 9 | |
9 | 1nen2 6748 | . . . . . . . . . . 11 | |
10 | ensym 6668 | . . . . . . . . . . . 12 | |
11 | entr 6671 | . . . . . . . . . . . . 13 | |
12 | 11 | ex 114 | . . . . . . . . . . . 12 |
13 | 10, 12 | syl 14 | . . . . . . . . . . 11 |
14 | 9, 13 | mtoi 653 | . . . . . . . . . 10 |
15 | 14 | a1d 22 | . . . . . . . . 9 |
16 | 8, 15 | syl 14 | . . . . . . . 8 |
17 | 16 | ex 114 | . . . . . . 7 |
18 | 17 | com3r 79 | . . . . . 6 |
19 | 7, 18 | syld 45 | . . . . 5 |
20 | 4, 19 | mpid 42 | . . . 4 |
21 | 2, 20 | syl5 32 | . . 3 |
22 | 21 | necon2ad 2363 | . 2 |
23 | pr2nelem 7040 | . . 3 | |
24 | 23 | 3expia 1183 | . 2 |
25 | 22, 24 | impbid 128 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 103 wb 104 wceq 1331 wcel 1480 wne 2306 cvv 2681 cpr 3523 class class class wbr 3924 c1o 6299 c2o 6300 cen 6625 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-nul 4049 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-setind 4447 ax-iinf 4497 |
This theorem depends on definitions: df-bi 116 df-dc 820 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-ral 2419 df-rex 2420 df-reu 2421 df-rab 2423 df-v 2683 df-sbc 2905 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-br 3925 df-opab 3985 df-tr 4022 df-id 4210 df-iord 4283 df-on 4285 df-suc 4288 df-iom 4500 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-res 4546 df-ima 4547 df-iota 5083 df-fun 5120 df-fn 5121 df-f 5122 df-f1 5123 df-fo 5124 df-f1o 5125 df-fv 5126 df-1o 6306 df-2o 6307 df-er 6422 df-en 6628 |
This theorem is referenced by: exmidonfinlem 7042 isprm2lem 11786 pw1dom2 13179 |
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