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| Mirrors > Home > ILE Home > Th. List > f1ocnv | Unicode version | ||
| Description: The converse of a one-to-one onto function is also one-to-one onto. (Contributed by NM, 11-Feb-1997.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
| Ref | Expression |
|---|---|
| f1ocnv |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fnrel 5356 |
. . . . 5
| |
| 2 | dfrel2 5120 |
. . . . . 6
| |
| 3 | fneq1 5346 |
. . . . . . 7
| |
| 4 | 3 | biimprd 158 |
. . . . . 6
|
| 5 | 2, 4 | sylbi 121 |
. . . . 5
|
| 6 | 1, 5 | mpcom 36 |
. . . 4
|
| 7 | 6 | anim2i 342 |
. . 3
|
| 8 | 7 | ancoms 268 |
. 2
|
| 9 | dff1o4 5512 |
. 2
| |
| 10 | dff1o4 5512 |
. 2
| |
| 11 | 8, 9, 10 | 3imtr4i 201 |
1
|
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