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| Description: A singleton of an ordered pair is one-to-one onto function. |
| Ref | Expression |
|---|---|
| f1osn.1 |
|
| f1osn.2 |
|
| Ref | Expression |
|---|---|
| f1osn |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f1o4 3681 |
. 2
| |
| 2 | df-fn 3183 |
. . 3
| |
| 3 | f1osn.1 |
. . . 4
| |
| 4 | f1osn.2 |
. . . 4
| |
| 5 | 3, 4 | funsn 3529 |
. . 3
|
| 6 | dmsnop 3317 |
. . 3
| |
| 7 | 2, 5, 6 | mpbir2an 728 |
. 2
|
| 8 | df-fn 3183 |
. . . 4
| |
| 9 | 4, 3 | funsn 3529 |
. . . 4
|
| 10 | dmsnop 3317 |
. . . 4
| |
| 11 | 8, 9, 10 | mpbir2an 728 |
. . 3
|
| 12 | 3, 4 | cnvsn 3435 |
. . . 4
|
| 13 | fneq1 3568 |
. . . 4
| |
| 14 | 12, 13 | ax-mp 7 |
. . 3
|
| 15 | 11, 14 | mpbir 190 |
. 2
|
| 16 | 1, 7, 15 | mpbir2an 728 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: fvsnun2 3781 fsn 3819 fopabsn 3825 mapsn 4329 ensn1 4405 phplem2 4489 pssnn 4513 acdc2lem2 7431 acdc5lem2 7434 ruclem6 7458 grpsn 8061 ablsn 8062 1alg 10498 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-sep 2693 ax-nul 2700 ax-pow 2732 ax-pr 2769 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 775 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-br 2610 df-opab 2657 df-id 2824 df-xp 3174 df-rel 3175 df-cnv 3176 df-co 3177 df-dm 3178 df-rn 3179 df-fun 3182 df-fn 3183 df-f 3184 df-f1 3185 df-fo 3186 df-f1o 3187 |