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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 6484 |
. 2
| |
| 2 | ssun2 3385 |
. . . . 5
| |
| 3 | 0ex 4239 |
. . . . . 6
| |
| 4 | 3 | snid 3722 |
. . . . 5
|
| 5 | 2, 4 | sselii 3237 |
. . . 4
|
| 6 | 5 | biantrur 303 |
. . 3
|
| 7 | cnvsn0 5233 |
. . . . . 6
| |
| 8 | 7 | unieqi 3926 |
. . . . 5
|
| 9 | uni0 3943 |
. . . . 5
| |
| 10 | 8, 9 | eqtri 2255 |
. . . 4
|
| 11 | 10 | breq1i 4118 |
. . 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4230 ax-nul 4238 ax-pow 4289 ax-pr 4324 ax-un 4556 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-ral 2527 df-rex 2528 df-rab 2531 df-v 2817 df-sbc 3045 df-dif 3215 df-un 3217 df-in 3219 df-ss 3226 df-nul 3511 df-pw 3673 df-sn 3697 df-pr 3698 df-op 3700 df-uni 3917 df-br 4112 df-opab 4174 df-mpt 4175 df-id 4416 df-xp 4757 df-rel 4758 df-cnv 4759 df-co 4760 df-dm 4761 df-rn 4762 df-res 4763 df-ima 4764 df-iota 5314 df-fun 5356 df-fn 5357 df-fv 5362 df-tpos 6478 |
| This theorem is referenced by: reldmtpos 6486 tpostpos 6497 |
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