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Mirrors > Home > ILE Home > Th. List > en1eqsn | Unicode version |
Description: A set with one element is a singleton. (Contributed by FL, 18-Aug-2008.) |
Ref | Expression |
---|---|
en1eqsn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1onn 6409 | . . . . . 6 | |
2 | nnfi 6759 | . . . . . 6 | |
3 | 1, 2 | ax-mp 5 | . . . . 5 |
4 | enfii 6761 | . . . . 5 | |
5 | 3, 4 | mpan 420 | . . . 4 |
6 | 5 | adantl 275 | . . 3 |
7 | snssi 3659 | . . . 4 | |
8 | 7 | adantr 274 | . . 3 |
9 | ensn1g 6684 | . . . 4 | |
10 | ensym 6668 | . . . 4 | |
11 | entr 6671 | . . . 4 | |
12 | 9, 10, 11 | syl2an 287 | . . 3 |
13 | fisseneq 6813 | . . 3 | |
14 | 6, 8, 12, 13 | syl3anc 1216 | . 2 |
15 | 14 | eqcomd 2143 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wceq 1331 wcel 1480 wss 3066 csn 3522 class class class wbr 3924 com 4499 c1o 6299 cen 6625 cfn 6627 |
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-coll 4038 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-csb 2999 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-if 3470 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-iun 3810 df-br 3925 df-opab 3985 df-mpt 3986 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-er 6422 df-en 6628 df-fin 6630 |
This theorem is referenced by: en1eqsnbi 6830 en1top 12235 |
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