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Mirrors > Home > ILE Home > Th. List > base0 | GIF version |
Description: The base set of the empty structure. (Contributed by David A. Wheeler, 7-Jul-2016.) |
Ref | Expression |
---|---|
base0 | ⊢ ∅ = (Base‘∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-base 11954 | . . 3 ⊢ Base = Slot 1 | |
2 | 1nn 8724 | . . 3 ⊢ 1 ∈ ℕ | |
3 | 1, 2 | ndxslid 11973 | . 2 ⊢ (Base = Slot (Base‘ndx) ∧ (Base‘ndx) ∈ ℕ) |
4 | 3 | strsl0 11996 | 1 ⊢ ∅ = (Base‘∅) |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∅c0 3358 ‘cfv 5118 1c1 7614 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-in1 603 ax-in2 604 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-nul 4049 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-fal 1337 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-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 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: (None) |
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