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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 18600 | . 2 β’ ((π· β DirRel β§ π΄ β π) β π΄π·π΄) |
3 | 1 | eltail 35891 | . . 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 256 | 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 394 = wceq 1533 β wcel 2098 class class class wbr 5152 dom cdm 5682 βcfv 6553 DirRelcdir 18593 tailctail 18594 |
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 2166 ax-ext 2699 ax-rep 5289 ax-sep 5303 ax-nul 5310 ax-pr 5433 ax-un 7746 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-ral 3059 df-rex 3068 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4327 df-if 4533 df-sn 4633 df-pr 4635 df-op 4639 df-uni 4913 df-iun 5002 df-br 5153 df-opab 5215 df-mpt 5236 df-id 5580 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-dir 18595 df-tail 18596 |
This theorem is referenced by: tailfb 35894 |
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