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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 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | brtpos2 6304 |
. 2
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2 | ssun2 3323 |
. . . . 5
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3 | 0ex 4156 |
. . . . . 6
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4 | 3 | snid 3649 |
. . . . 5
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5 | 2, 4 | sselii 3176 |
. . . 4
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6 | 5 | biantrur 303 |
. . 3
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7 | cnvsn0 5134 |
. . . . . 6
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8 | 7 | unieqi 3845 |
. . . . 5
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9 | uni0 3862 |
. . . . 5
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10 | 8, 9 | eqtri 2214 |
. . . 4
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11 | 10 | breq1i 4036 |
. . 3
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12 | 6, 11 | bitr3i 186 |
. 2
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13 | 1, 12 | bitrdi 196 |
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-in1 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2166 ax-14 2167 ax-ext 2175 ax-sep 4147 ax-nul 4155 ax-pow 4203 ax-pr 4238 ax-un 4464 |
This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2045 df-mo 2046 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ne 2365 df-ral 2477 df-rex 2478 df-rab 2481 df-v 2762 df-sbc 2986 df-dif 3155 df-un 3157 df-in 3159 df-ss 3166 df-nul 3447 df-pw 3603 df-sn 3624 df-pr 3625 df-op 3627 df-uni 3836 df-br 4030 df-opab 4091 df-mpt 4092 df-id 4324 df-xp 4665 df-rel 4666 df-cnv 4667 df-co 4668 df-dm 4669 df-rn 4670 df-res 4671 df-ima 4672 df-iota 5215 df-fun 5256 df-fn 5257 df-fv 5262 df-tpos 6298 |
This theorem is referenced by: reldmtpos 6306 tpostpos 6317 |
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