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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 6516 |
. 2
| |
| 2 | ssun2 3393 |
. . . . 5
| |
| 3 | 0ex 4258 |
. . . . . 6
| |
| 4 | 3 | snid 3739 |
. . . . 5
|
| 5 | 2, 4 | sselii 3245 |
. . . 4
|
| 6 | 5 | biantrur 303 |
. . 3
|
| 7 | cnvsn0 5254 |
. . . . . 6
| |
| 8 | 7 | unieqi 3943 |
. . . . 5
|
| 9 | uni0 3960 |
. . . . 5
| |
| 10 | 8, 9 | eqtri 2259 |
. . . 4
|
| 11 | 10 | breq1i 4135 |
. . 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 623 ax-in2 624 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 4247 ax-nul 4257 ax-pow 4309 ax-pr 4344 ax-un 4576 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 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-ne 2421 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-br 4129 df-opab 4191 df-mpt 4192 df-id 4436 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-rn 4783 df-res 4784 df-ima 4785 df-iota 5335 df-fun 5377 df-fn 5378 df-fv 5383 df-tpos 6510 |
| This theorem is referenced by: reldmtpos 6518 tpostpos 6529 |
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