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| Mirrors > Home > ILE Home > Th. List > brtpos0 | Unicode version | ||
| Description: The behavior of tpos when the left argument is the empty set (which is not an ordered pair but is the "default" value of an ordered pair when the arguments are proper classes). (Contributed by Mario Carneiro, 10-Sep-2015.) |
| Ref | Expression |
|---|---|
| brtpos0 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | brtpos2 6337 |
. 2
| |
| 2 | ssun2 3337 |
. . . . 5
| |
| 3 | 0ex 4171 |
. . . . . 6
| |
| 4 | 3 | snid 3664 |
. . . . 5
|
| 5 | 2, 4 | sselii 3190 |
. . . 4
|
| 6 | 5 | biantrur 303 |
. . 3
|
| 7 | cnvsn0 5151 |
. . . . . 6
| |
| 8 | 7 | unieqi 3860 |
. . . . 5
|
| 9 | uni0 3877 |
. . . . 5
| |
| 10 | 8, 9 | eqtri 2226 |
. . . 4
|
| 11 | 10 | breq1i 4051 |
. . 3
|
| 12 | 6, 11 | bitr3i 186 |
. 2
|
| 13 | 1, 12 | bitrdi 196 |
1
|
| 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-in1 615 ax-in2 616 ax-io 711 ax-5 1470 ax-7 1471 ax-gen 1472 ax-ie1 1516 ax-ie2 1517 ax-8 1527 ax-10 1528 ax-11 1529 ax-i12 1530 ax-bndl 1532 ax-4 1533 ax-17 1549 ax-i9 1553 ax-ial 1557 ax-i5r 1558 ax-13 2178 ax-14 2179 ax-ext 2187 ax-sep 4162 ax-nul 4170 ax-pow 4218 ax-pr 4253 ax-un 4480 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1484 df-sb 1786 df-eu 2057 df-mo 2058 df-clab 2192 df-cleq 2198 df-clel 2201 df-nfc 2337 df-ne 2377 df-ral 2489 df-rex 2490 df-rab 2493 df-v 2774 df-sbc 2999 df-dif 3168 df-un 3170 df-in 3172 df-ss 3179 df-nul 3461 df-pw 3618 df-sn 3639 df-pr 3640 df-op 3642 df-uni 3851 df-br 4045 df-opab 4106 df-mpt 4107 df-id 4340 df-xp 4681 df-rel 4682 df-cnv 4683 df-co 4684 df-dm 4685 df-rn 4686 df-res 4687 df-ima 4688 df-iota 5232 df-fun 5273 df-fn 5274 df-fv 5279 df-tpos 6331 |
| This theorem is referenced by: reldmtpos 6339 tpostpos 6350 |
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