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Mirrors > Home > ILE Home > Th. List > strndxid | GIF version |
Description: The value of a structure component extractor is the value of the corresponding slot of the structure. (Contributed by AV, 13-Mar-2020.) |
Ref | Expression |
---|---|
strndxid.s | ⊢ (𝜑 → 𝑆 ∈ 𝑉) |
strndxid.e | ⊢ 𝐸 = Slot 𝑁 |
strndxid.n | ⊢ 𝑁 ∈ ℕ |
Ref | Expression |
---|---|
strndxid | ⊢ (𝜑 → (𝑆‘(𝐸‘ndx)) = (𝐸‘𝑆)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | strndxid.e | . . . 4 ⊢ 𝐸 = Slot 𝑁 | |
2 | strndxid.n | . . . 4 ⊢ 𝑁 ∈ ℕ | |
3 | 1, 2 | ndxid 12355 | . . 3 ⊢ 𝐸 = Slot (𝐸‘ndx) |
4 | strndxid.s | . . 3 ⊢ (𝜑 → 𝑆 ∈ 𝑉) | |
5 | 1, 2 | ndxarg 12354 | . . . . 5 ⊢ (𝐸‘ndx) = 𝑁 |
6 | 5, 2 | eqeltri 2237 | . . . 4 ⊢ (𝐸‘ndx) ∈ ℕ |
7 | 6 | a1i 9 | . . 3 ⊢ (𝜑 → (𝐸‘ndx) ∈ ℕ) |
8 | 3, 4, 7 | strnfvnd 12351 | . 2 ⊢ (𝜑 → (𝐸‘𝑆) = (𝑆‘(𝐸‘ndx))) |
9 | 8 | eqcomd 2170 | 1 ⊢ (𝜑 → (𝑆‘(𝐸‘ndx)) = (𝐸‘𝑆)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1342 ∈ wcel 2135 ‘cfv 5182 ℕcn 8848 ndxcnx 12328 Slot cslot 12330 |
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 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-pow 4147 ax-pr 4181 ax-un 4405 ax-cnex 7835 ax-resscn 7836 ax-1re 7838 ax-addrcl 7841 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rex 2448 df-v 2723 df-sbc 2947 df-un 3115 df-in 3117 df-ss 3124 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-int 3819 df-br 3977 df-opab 4038 df-mpt 4039 df-id 4265 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-rn 4609 df-res 4610 df-iota 5147 df-fun 5184 df-fv 5190 df-inn 8849 df-ndx 12334 df-slot 12335 |
This theorem is referenced by: (None) |
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