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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 13046 | . . 3 ⊢ Base = Slot 1 | |
| 2 | 1nn 9129 | . . 3 ⊢ 1 ∈ ℕ | |
| 3 | 1, 2 | ndxslid 13065 | . 2 ⊢ (Base = Slot (Base‘ndx) ∧ (Base‘ndx) ∈ ℕ) |
| 4 | 3 | strsl0 13089 | 1 ⊢ ∅ = (Base‘∅) |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1395 ∅c0 3491 ‘cfv 5318 1c1 8008 Basecbs 13040 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-nul 4210 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-cnex 8098 ax-resscn 8099 ax-1re 8101 ax-addrcl 8104 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2801 df-sbc 3029 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-int 3924 df-br 4084 df-opab 4146 df-mpt 4147 df-id 4384 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-rn 4730 df-res 4731 df-iota 5278 df-fun 5320 df-fv 5326 df-inn 9119 df-ndx 13043 df-slot 13044 df-base 13046 |
| This theorem is referenced by: 0g0 13417 grpn0 13576 vtxval0 15862 |
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