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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 6422 |
. 2
| |
| 2 | ssun2 3370 |
. . . . 5
| |
| 3 | 0ex 4217 |
. . . . . 6
| |
| 4 | 3 | snid 3701 |
. . . . 5
|
| 5 | 2, 4 | sselii 3223 |
. . . 4
|
| 6 | 5 | biantrur 303 |
. . 3
|
| 7 | cnvsn0 5207 |
. . . . . 6
| |
| 8 | 7 | unieqi 3904 |
. . . . 5
|
| 9 | uni0 3921 |
. . . . 5
| |
| 10 | 8, 9 | eqtri 2251 |
. . . 4
|
| 11 | 10 | breq1i 4096 |
. . 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2203 ax-14 2204 ax-ext 2212 ax-sep 4208 ax-nul 4216 ax-pow 4266 ax-pr 4301 ax-un 4532 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ne 2402 df-ral 2514 df-rex 2515 df-rab 2518 df-v 2803 df-sbc 3031 df-dif 3201 df-un 3203 df-in 3205 df-ss 3212 df-nul 3494 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-uni 3895 df-br 4090 df-opab 4152 df-mpt 4153 df-id 4392 df-xp 4733 df-rel 4734 df-cnv 4735 df-co 4736 df-dm 4737 df-rn 4738 df-res 4739 df-ima 4740 df-iota 5288 df-fun 5330 df-fn 5331 df-fv 5336 df-tpos 6416 |
| This theorem is referenced by: reldmtpos 6424 tpostpos 6435 |
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