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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 12882 | . . 3 ⊢ Base = Slot 1 | |
| 2 | 1nn 9054 | . . 3 ⊢ 1 ∈ ℕ | |
| 3 | 1, 2 | ndxslid 12901 | . 2 ⊢ (Base = Slot (Base‘ndx) ∧ (Base‘ndx) ∈ ℕ) |
| 4 | 3 | strsl0 12925 | 1 ⊢ ∅ = (Base‘∅) |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1373 ∅c0 3461 ‘cfv 5276 1c1 7933 Basecbs 12876 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-sep 4166 ax-nul 4174 ax-pow 4222 ax-pr 4257 ax-un 4484 ax-cnex 8023 ax-resscn 8024 ax-1re 8026 ax-addrcl 8029 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-v 2775 df-sbc 3000 df-dif 3169 df-un 3171 df-in 3173 df-ss 3180 df-nul 3462 df-pw 3619 df-sn 3640 df-pr 3641 df-op 3643 df-uni 3853 df-int 3888 df-br 4048 df-opab 4110 df-mpt 4111 df-id 4344 df-xp 4685 df-rel 4686 df-cnv 4687 df-co 4688 df-dm 4689 df-rn 4690 df-res 4691 df-iota 5237 df-fun 5278 df-fv 5284 df-inn 9044 df-ndx 12879 df-slot 12880 df-base 12882 |
| This theorem is referenced by: 0g0 13252 grpn0 13411 vtxval0 15694 |
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