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Mirrors > Home > ILE Home > Th. List > basendxnn | GIF version |
Description: The index value of the base set extractor is a positive integer. This property should be ensured for every concrete coding because otherwise it could not be used in an extensible structure (slots must be positive integers). (Contributed by AV, 23-Sep-2020.) |
Ref | Expression |
---|---|
basendxnn | ⊢ (Base‘ndx) ∈ ℕ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-base 11954 | . . 3 ⊢ Base = Slot 1 | |
2 | 1nn 8724 | . . 3 ⊢ 1 ∈ ℕ | |
3 | 1, 2 | ndxarg 11971 | . 2 ⊢ (Base‘ndx) = 1 |
4 | 3, 2 | eqeltri 2210 | 1 ⊢ (Base‘ndx) ∈ ℕ |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1480 ‘cfv 5118 1c1 7614 ℕcn 8713 ndxcnx 11945 Basecbs 11948 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-cnex 7704 ax-resscn 7705 ax-1re 7707 ax-addrcl 7710 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-v 2683 df-sbc 2905 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-br 3925 df-opab 3985 df-mpt 3986 df-id 4210 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-res 4546 df-iota 5083 df-fun 5120 df-fv 5126 df-inn 8714 df-ndx 11951 df-slot 11952 df-base 11954 |
This theorem is referenced by: baseslid 12004 ressval2 12008 ressid 12009 1strbas 12047 2strbasg 12049 2stropg 12050 2strbas1g 12052 rngbaseg 12064 srngbased 12071 lmodbased 12082 ipsbased 12090 topgrpbasd 12100 |
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