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| Mirrors > Home > ILE Home > Th. List > f1osn | Unicode version | ||
| Description: A singleton of an ordered pair is one-to-one onto function. (Contributed by NM, 18-May-1998.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
| Ref | Expression |
|---|---|
| f1osn.1 |
|
| f1osn.2 |
|
| Ref | Expression |
|---|---|
| f1osn |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f1osn.1 |
. . 3
| |
| 2 | f1osn.2 |
. . 3
| |
| 3 | 1, 2 | fnsn 5435 |
. 2
|
| 4 | 2, 1 | fnsn 5435 |
. . 3
|
| 5 | 1, 2 | cnvsn 5270 |
. . . 4
|
| 6 | 5 | fneq1i 5475 |
. . 3
|
| 7 | 4, 6 | mpbir 146 |
. 2
|
| 8 | dff1o4 5647 |
. 2
| |
| 9 | 3, 7, 8 | mpbir2an 955 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 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 4249 ax-pow 4311 ax-pr 4346 |
| This proof 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-ral 2533 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-br 4131 df-opab 4193 df-id 4438 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-fun 5379 df-fn 5380 df-f 5381 df-f1 5382 df-fo 5383 df-f1o 5384 |
| This theorem is used by: f1osng 5682 fsn 5880 mapsn 6972 ensn1 7083 phplem2 7154 ac6sfi 7202 fxnn0nninf 10876 hashf1lem1 11285 |
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