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Mirrors > Home > MPE Home > Th. List > difid | Structured version Visualization version GIF version |
Description: The difference between a class and itself is the empty set. Proposition 5.15 of [TakeutiZaring] p. 20. Also Theorem 32 of [Suppes] p. 28. (Contributed by NM, 22-Apr-2004.) |
Ref | Expression |
---|---|
difid | ⊢ (𝐴 ∖ 𝐴) = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssid 3989 | . 2 ⊢ 𝐴 ⊆ 𝐴 | |
2 | ssdif0 4323 | . 2 ⊢ (𝐴 ⊆ 𝐴 ↔ (𝐴 ∖ 𝐴) = ∅) | |
3 | 1, 2 | mpbi 232 | 1 ⊢ (𝐴 ∖ 𝐴) = ∅ |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ∖ cdif 3933 ⊆ wss 3936 ∅c0 4291 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-v 3496 df-dif 3939 df-in 3943 df-ss 3952 df-nul 4292 |
This theorem is referenced by: dif0 4332 difun2 4429 diftpsn3 4735 symdifid 5009 difxp1 6022 difxp2 6023 2oconcl 8128 oev2 8148 fin1a2lem13 9834 ruclem13 15595 strle1 16592 efgi1 18847 frgpuptinv 18897 gsumdifsnd 19081 dprdsn 19158 ablfac1eulem 19194 fctop 21612 cctop 21614 topcld 21643 indiscld 21699 mretopd 21700 restcld 21780 conndisj 22024 csdfil 22502 ufinffr 22537 prdsxmslem2 23139 bcth3 23934 voliunlem3 24153 uhgr0vb 26857 uhgr0 26858 nbgr1vtx 27140 uvtx01vtx 27179 cplgr1v 27212 frgr1v 28050 1vwmgr 28055 difres 30350 imadifxp 30351 difico 30506 fzodif1 30516 symgcom2 30728 cycpmrn 30785 tocyccntz 30786 lindssn 30939 lbslsat 31014 0elsiga 31373 prsiga 31390 fiunelcarsg 31574 sibf0 31592 probun 31677 ballotlemfp1 31749 onint1 33797 poimirlem22 34929 poimirlem30 34937 zrdivrng 35246 ntrk0kbimka 40438 clsk3nimkb 40439 ntrclscls00 40465 ntrclskb 40468 ntrneicls11 40489 compne 40822 fzdifsuc2 41626 dvmptfprodlem 42278 fouriercn 42566 prsal 42652 caragenuncllem 42843 carageniuncllem1 42852 caratheodorylem1 42857 gsumdifsndf 44137 |
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