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Mirrors > Home > MPE Home > Th. List > Mathboxes > tailini | Structured version Visualization version GIF version |
Description: A tail contains its initial element. (Contributed by Jeff Hankins, 25-Nov-2009.) |
Ref | Expression |
---|---|
tailini.1 | β’ π = dom π· |
Ref | Expression |
---|---|
tailini | β’ ((π· β DirRel β§ π΄ β π) β π΄ β ((tailβπ·)βπ΄)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tailini.1 | . . 3 β’ π = dom π· | |
2 | 1 | dirref 18563 | . 2 β’ ((π· β DirRel β§ π΄ β π) β π΄π·π΄) |
3 | 1 | eltail 35766 | . . 3 β’ ((π· β DirRel β§ π΄ β π β§ π΄ β π) β (π΄ β ((tailβπ·)βπ΄) β π΄π·π΄)) |
4 | 3 | 3anidm23 1418 | . 2 β’ ((π· β DirRel β§ π΄ β π) β (π΄ β ((tailβπ·)βπ΄) β π΄π·π΄)) |
5 | 2, 4 | mpbird 257 | 1 β’ ((π· β DirRel β§ π΄ β π) β π΄ β ((tailβπ·)βπ΄)) |
Colors of variables: wff setvar class |
Syntax hints: β wi 4 β wb 205 β§ wa 395 = wceq 1533 β wcel 2098 class class class wbr 5141 dom cdm 5669 βcfv 6536 DirRelcdir 18556 tailctail 18557 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-rep 5278 ax-sep 5292 ax-nul 5299 ax-pr 5420 ax-un 7721 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-ral 3056 df-rex 3065 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-nul 4318 df-if 4524 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-id 5567 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-iota 6488 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-dir 18558 df-tail 18559 |
This theorem is referenced by: tailfb 35769 |
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