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Mirrors > Home > MPE Home > Th. List > brtpos0 | Structured version Visualization version 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). This allows us to eliminate sethood hypotheses on in brtpos 7361. (Contributed by Mario Carneiro, 10-Sep-2015.) |
Ref | Expression |
---|---|
brtpos0 | tpos |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | brtpos2 7358 | . 2 tpos | |
2 | ssun2 3777 | . . . . 5 | |
3 | 0ex 4790 | . . . . . 6 | |
4 | 3 | snid 4208 | . . . . 5 |
5 | 2, 4 | sselii 3600 | . . . 4 |
6 | 5 | biantrur 527 | . . 3 |
7 | cnvsn0 5603 | . . . . . 6 | |
8 | 7 | unieqi 4445 | . . . . 5 |
9 | uni0 4465 | . . . . 5 | |
10 | 8, 9 | eqtri 2644 | . . . 4 |
11 | 10 | breq1i 4660 | . . 3 |
12 | 6, 11 | bitr3i 266 | . 2 |
13 | 1, 12 | syl6bb 276 | 1 tpos |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wa 384 wcel 1990 cun 3572 c0 3915 csn 4177 cuni 4436 class class class wbr 4653 ccnv 5113 cdm 5114 tpos ctpos 7351 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-sbc 3436 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-mpt 4730 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-iota 5851 df-fun 5890 df-fn 5891 df-fv 5896 df-tpos 7352 |
This theorem is referenced by: reldmtpos 7360 brtpos 7361 tpostpos 7372 |
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