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| Mirrors > Home > ILE Home > Th. List > strsl0 | GIF version | ||
| Description: All components of the empty set are empty sets. (Contributed by Stefan O'Rear, 27-Nov-2014.) (Revised by Jim Kingdon, 31-Jan-2023.) |
| Ref | Expression |
|---|---|
| strsl0.e | ⊢ (𝐸 = Slot (𝐸‘ndx) ∧ (𝐸‘ndx) ∈ ℕ) |
| Ref | Expression |
|---|---|
| strsl0 | ⊢ ∅ = (𝐸‘∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ex 4216 | . . 3 ⊢ ∅ ∈ V | |
| 2 | strsl0.e | . . . 4 ⊢ (𝐸 = Slot (𝐸‘ndx) ∧ (𝐸‘ndx) ∈ ℕ) | |
| 3 | 2 | simpli 111 | . . 3 ⊢ 𝐸 = Slot (𝐸‘ndx) |
| 4 | 2 | simpri 113 | . . 3 ⊢ (𝐸‘ndx) ∈ ℕ |
| 5 | 1, 3, 4 | strnfvn 13108 | . 2 ⊢ (𝐸‘∅) = (∅‘(𝐸‘ndx)) |
| 6 | 0fv 5677 | . 2 ⊢ (∅‘(𝐸‘ndx)) = ∅ | |
| 7 | 5, 6 | eqtr2i 2253 | 1 ⊢ ∅ = (𝐸‘∅) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 = wceq 1397 ∈ wcel 2202 ∅c0 3494 ‘cfv 5326 ℕcn 9143 ndxcnx 13084 Slot cslot 13086 |
| 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-nul 4215 ax-pow 4264 ax-pr 4299 ax-un 4530 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-sbc 3032 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-opab 4151 df-mpt 4152 df-id 4390 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-rn 4736 df-iota 5286 df-fun 5328 df-fv 5334 df-slot 13091 |
| This theorem is referenced by: base0 13137 iedgval0 15911 |
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