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| Mirrors > Home > MPE Home > Th. List > elpreima | Structured version Visualization version Unicode version | ||
| Description: Membership in the preimage of a set under a function. (Contributed by Jeff Madsen, 2-Sep-2009.) |
| Ref | Expression |
|---|---|
| elpreima |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnvimass 5485 |
. . . . 5
| |
| 2 | 1 | sseli 3599 |
. . . 4
|
| 3 | fndm 5990 |
. . . . 5
| |
| 4 | 3 | eleq2d 2687 |
. . . 4
|
| 5 | 2, 4 | syl5ib 234 |
. . 3
|
| 6 | fnfun 5988 |
. . . . 5
| |
| 7 | fvimacnvi 6331 |
. . . . 5
| |
| 8 | 6, 7 | sylan 488 |
. . . 4
|
| 9 | 8 | ex 450 |
. . 3
|
| 10 | 5, 9 | jcad 555 |
. 2
|
| 11 | fvimacnv 6332 |
. . . . 5
| |
| 12 | 11 | funfni 5991 |
. . . 4
|
| 13 | 12 | biimpd 219 |
. . 3
|
| 14 | 13 | expimpd 629 |
. 2
|
| 15 | 10, 14 | impbid 202 |
1
|
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