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Mirrors > Home > ILE Home > Th. List > dfimafn2 | Unicode version |
Description: Alternate definition of the image of a function as an indexed union of singletons of function values. (Contributed by Raph Levien, 20-Nov-2006.) |
Ref | Expression |
---|---|
dfimafn2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfimafn 5563 |
. . 3
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2 | iunab 3932 |
. . 3
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3 | 1, 2 | eqtr4di 2228 |
. 2
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4 | df-sn 3598 |
. . . . 5
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5 | eqcom 2179 |
. . . . . 6
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6 | 5 | abbii 2293 |
. . . . 5
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7 | 4, 6 | eqtri 2198 |
. . . 4
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8 | 7 | a1i 9 |
. . 3
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9 | 8 | iuneq2i 3904 |
. 2
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10 | 3, 9 | eqtr4di 2228 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-14 2151 ax-ext 2159 ax-sep 4120 ax-pow 4173 ax-pr 4208 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ral 2460 df-rex 2461 df-v 2739 df-sbc 2963 df-un 3133 df-in 3135 df-ss 3142 df-pw 3577 df-sn 3598 df-pr 3599 df-op 3601 df-uni 3810 df-iun 3888 df-br 4003 df-opab 4064 df-id 4292 df-xp 4631 df-rel 4632 df-cnv 4633 df-co 4634 df-dm 4635 df-rn 4636 df-res 4637 df-ima 4638 df-iota 5177 df-fun 5217 df-fn 5218 df-fv 5223 |
This theorem is referenced by: (None) |
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