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Mirrors > Home > MPE Home > Th. List > res0 | Structured version Visualization version GIF version |
Description: A restriction to the empty set is empty. (Contributed by NM, 12-Nov-1994.) |
Ref | Expression |
---|---|
res0 | ⊢ (𝐴 ↾ ∅) = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-res 5531 | . 2 ⊢ (𝐴 ↾ ∅) = (𝐴 ∩ (∅ × V)) | |
2 | 0xp 5613 | . . 3 ⊢ (∅ × V) = ∅ | |
3 | 2 | ineq2i 4136 | . 2 ⊢ (𝐴 ∩ (∅ × V)) = (𝐴 ∩ ∅) |
4 | in0 4299 | . 2 ⊢ (𝐴 ∩ ∅) = ∅ | |
5 | 1, 3, 4 | 3eqtri 2825 | 1 ⊢ (𝐴 ↾ ∅) = ∅ |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1538 Vcvv 3441 ∩ cin 3880 ∅c0 4243 × cxp 5517 ↾ cres 5521 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-rab 3115 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-opab 5093 df-xp 5525 df-res 5531 |
This theorem is referenced by: ima0 5912 resdisj 5993 smo0 7978 tfrlem16 8012 tz7.44-1 8025 mapunen 8670 fnfi 8780 ackbij2lem3 9652 hashf1lem1 13809 setsid 16530 meet0 17739 join0 17740 frmdplusg 18011 psgn0fv0 18631 gsum2dlem2 19084 ablfac1eulem 19187 ablfac1eu 19188 psrplusg 20619 ply1plusgfvi 20871 ptuncnv 22412 ptcmpfi 22418 ust0 22825 xrge0gsumle 23438 xrge0tsms 23439 jensen 25574 egrsubgr 27067 0grsubgr 27068 pthdlem1 27555 0pth 27910 1pthdlem1 27920 eupth2lemb 28022 fressupp 30448 resf1o 30492 xrge0tsmsd 30742 gsumle 30775 zarcmplem 31234 esumsnf 31433 satfv1lem 32722 dfpo2 33104 eldm3 33110 rdgprc0 33151 zrdivrng 35391 eldioph4b 39752 diophren 39754 ismeannd 43106 psmeasure 43110 isomennd 43170 hoidmvlelem3 43236 aacllem 45329 |
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