| Step | Hyp | Ref
| Expression |
| 1 | | prodeq1 11718 |
. . 3
⊢ (𝑤 = ∅ → ∏𝑘 ∈ 𝑤 𝐵 = ∏𝑘 ∈ ∅ 𝐵) |
| 2 | | fveq2 5558 |
. . . 4
⊢ (𝑤 = ∅ →
(♯‘𝑤) =
(♯‘∅)) |
| 3 | 2 | oveq2d 5938 |
. . 3
⊢ (𝑤 = ∅ → (𝐵↑(♯‘𝑤)) = (𝐵↑(♯‘∅))) |
| 4 | 1, 3 | eqeq12d 2211 |
. 2
⊢ (𝑤 = ∅ → (∏𝑘 ∈ 𝑤 𝐵 = (𝐵↑(♯‘𝑤)) ↔ ∏𝑘 ∈ ∅ 𝐵 = (𝐵↑(♯‘∅)))) |
| 5 | | prodeq1 11718 |
. . 3
⊢ (𝑤 = 𝑦 → ∏𝑘 ∈ 𝑤 𝐵 = ∏𝑘 ∈ 𝑦 𝐵) |
| 6 | | fveq2 5558 |
. . . 4
⊢ (𝑤 = 𝑦 → (♯‘𝑤) = (♯‘𝑦)) |
| 7 | 6 | oveq2d 5938 |
. . 3
⊢ (𝑤 = 𝑦 → (𝐵↑(♯‘𝑤)) = (𝐵↑(♯‘𝑦))) |
| 8 | 5, 7 | eqeq12d 2211 |
. 2
⊢ (𝑤 = 𝑦 → (∏𝑘 ∈ 𝑤 𝐵 = (𝐵↑(♯‘𝑤)) ↔ ∏𝑘 ∈ 𝑦 𝐵 = (𝐵↑(♯‘𝑦)))) |
| 9 | | prodeq1 11718 |
. . 3
⊢ (𝑤 = (𝑦 ∪ {𝑧}) → ∏𝑘 ∈ 𝑤 𝐵 = ∏𝑘 ∈ (𝑦 ∪ {𝑧})𝐵) |
| 10 | | fveq2 5558 |
. . . 4
⊢ (𝑤 = (𝑦 ∪ {𝑧}) → (♯‘𝑤) = (♯‘(𝑦 ∪ {𝑧}))) |
| 11 | 10 | oveq2d 5938 |
. . 3
⊢ (𝑤 = (𝑦 ∪ {𝑧}) → (𝐵↑(♯‘𝑤)) = (𝐵↑(♯‘(𝑦 ∪ {𝑧})))) |
| 12 | 9, 11 | eqeq12d 2211 |
. 2
⊢ (𝑤 = (𝑦 ∪ {𝑧}) → (∏𝑘 ∈ 𝑤 𝐵 = (𝐵↑(♯‘𝑤)) ↔ ∏𝑘 ∈ (𝑦 ∪ {𝑧})𝐵 = (𝐵↑(♯‘(𝑦 ∪ {𝑧}))))) |
| 13 | | prodeq1 11718 |
. . 3
⊢ (𝑤 = 𝐴 → ∏𝑘 ∈ 𝑤 𝐵 = ∏𝑘 ∈ 𝐴 𝐵) |
| 14 | | fveq2 5558 |
. . . 4
⊢ (𝑤 = 𝐴 → (♯‘𝑤) = (♯‘𝐴)) |
| 15 | 14 | oveq2d 5938 |
. . 3
⊢ (𝑤 = 𝐴 → (𝐵↑(♯‘𝑤)) = (𝐵↑(♯‘𝐴))) |
| 16 | 13, 15 | eqeq12d 2211 |
. 2
⊢ (𝑤 = 𝐴 → (∏𝑘 ∈ 𝑤 𝐵 = (𝐵↑(♯‘𝑤)) ↔ ∏𝑘 ∈ 𝐴 𝐵 = (𝐵↑(♯‘𝐴)))) |
| 17 | | prod0 11750 |
. . 3
⊢
∏𝑘 ∈
∅ 𝐵 =
1 |
| 18 | | hash0 10888 |
. . . . 5
⊢
(♯‘∅) = 0 |
| 19 | 18 | oveq2i 5933 |
. . . 4
⊢ (𝐵↑(♯‘∅)) =
(𝐵↑0) |
| 20 | | simpr 110 |
. . . . 5
⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) → 𝐵 ∈
ℂ) |
| 21 | 20 | exp0d 10759 |
. . . 4
⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) → (𝐵↑0) = 1) |
| 22 | 19, 21 | eqtrid 2241 |
. . 3
⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) → (𝐵↑(♯‘∅)) =
1) |
| 23 | 17, 22 | eqtr4id 2248 |
. 2
⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) →
∏𝑘 ∈ ∅
𝐵 = (𝐵↑(♯‘∅))) |
| 24 | | simpr 110 |
. . . . 5
⊢
(((((𝐴 ∈ Fin
∧ 𝐵 ∈ ℂ)
∧ 𝑦 ∈ Fin) ∧
(𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) ∧ ∏𝑘 ∈ 𝑦 𝐵 = (𝐵↑(♯‘𝑦))) → ∏𝑘 ∈ 𝑦 𝐵 = (𝐵↑(♯‘𝑦))) |
| 25 | 24 | oveq1d 5937 |
. . . 4
⊢
(((((𝐴 ∈ Fin
∧ 𝐵 ∈ ℂ)
∧ 𝑦 ∈ Fin) ∧
(𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) ∧ ∏𝑘 ∈ 𝑦 𝐵 = (𝐵↑(♯‘𝑦))) → (∏𝑘 ∈ 𝑦 𝐵 · 𝐵) = ((𝐵↑(♯‘𝑦)) · 𝐵)) |
| 26 | | nfcv 2339 |
. . . . . . 7
⊢
Ⅎ𝑘𝐵 |
| 27 | | simplr 528 |
. . . . . . 7
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → 𝑦 ∈ Fin) |
| 28 | | simprr 531 |
. . . . . . 7
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → 𝑧 ∈ (𝐴 ∖ 𝑦)) |
| 29 | 28 | eldifbd 3169 |
. . . . . . 7
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → ¬ 𝑧 ∈ 𝑦) |
| 30 | | simp-4r 542 |
. . . . . . 7
⊢
(((((𝐴 ∈ Fin
∧ 𝐵 ∈ ℂ)
∧ 𝑦 ∈ Fin) ∧
(𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) ∧ 𝑘 ∈ 𝑦) → 𝐵 ∈ ℂ) |
| 31 | | simpllr 534 |
. . . . . . 7
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → 𝐵 ∈ ℂ) |
| 32 | | eqidd 2197 |
. . . . . . 7
⊢ (𝑘 = 𝑧 → 𝐵 = 𝐵) |
| 33 | 26, 27, 28, 29, 30, 31, 32 | fprodunsn 11769 |
. . . . . 6
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → ∏𝑘 ∈ (𝑦 ∪ {𝑧})𝐵 = (∏𝑘 ∈ 𝑦 𝐵 · 𝐵)) |
| 34 | 27, 29 | jca 306 |
. . . . . . . . 9
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → (𝑦 ∈ Fin ∧ ¬ 𝑧 ∈ 𝑦)) |
| 35 | | hashunsng 10899 |
. . . . . . . . 9
⊢ (𝑧 ∈ (𝐴 ∖ 𝑦) → ((𝑦 ∈ Fin ∧ ¬ 𝑧 ∈ 𝑦) → (♯‘(𝑦 ∪ {𝑧})) = ((♯‘𝑦) + 1))) |
| 36 | 28, 34, 35 | sylc 62 |
. . . . . . . 8
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → (♯‘(𝑦 ∪ {𝑧})) = ((♯‘𝑦) + 1)) |
| 37 | 36 | oveq2d 5938 |
. . . . . . 7
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → (𝐵↑(♯‘(𝑦 ∪ {𝑧}))) = (𝐵↑((♯‘𝑦) + 1))) |
| 38 | | hashcl 10873 |
. . . . . . . . 9
⊢ (𝑦 ∈ Fin →
(♯‘𝑦) ∈
ℕ0) |
| 39 | 27, 38 | syl 14 |
. . . . . . . 8
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → (♯‘𝑦) ∈
ℕ0) |
| 40 | 31, 39 | expp1d 10766 |
. . . . . . 7
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → (𝐵↑((♯‘𝑦) + 1)) = ((𝐵↑(♯‘𝑦)) · 𝐵)) |
| 41 | 37, 40 | eqtrd 2229 |
. . . . . 6
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → (𝐵↑(♯‘(𝑦 ∪ {𝑧}))) = ((𝐵↑(♯‘𝑦)) · 𝐵)) |
| 42 | 33, 41 | eqeq12d 2211 |
. . . . 5
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → (∏𝑘 ∈ (𝑦 ∪ {𝑧})𝐵 = (𝐵↑(♯‘(𝑦 ∪ {𝑧}))) ↔ (∏𝑘 ∈ 𝑦 𝐵 · 𝐵) = ((𝐵↑(♯‘𝑦)) · 𝐵))) |
| 43 | 42 | adantr 276 |
. . . 4
⊢
(((((𝐴 ∈ Fin
∧ 𝐵 ∈ ℂ)
∧ 𝑦 ∈ Fin) ∧
(𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) ∧ ∏𝑘 ∈ 𝑦 𝐵 = (𝐵↑(♯‘𝑦))) → (∏𝑘 ∈ (𝑦 ∪ {𝑧})𝐵 = (𝐵↑(♯‘(𝑦 ∪ {𝑧}))) ↔ (∏𝑘 ∈ 𝑦 𝐵 · 𝐵) = ((𝐵↑(♯‘𝑦)) · 𝐵))) |
| 44 | 25, 43 | mpbird 167 |
. . 3
⊢
(((((𝐴 ∈ Fin
∧ 𝐵 ∈ ℂ)
∧ 𝑦 ∈ Fin) ∧
(𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) ∧ ∏𝑘 ∈ 𝑦 𝐵 = (𝐵↑(♯‘𝑦))) → ∏𝑘 ∈ (𝑦 ∪ {𝑧})𝐵 = (𝐵↑(♯‘(𝑦 ∪ {𝑧})))) |
| 45 | 44 | ex 115 |
. 2
⊢ ((((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) ∧ 𝑦 ∈ Fin) ∧ (𝑦 ⊆ 𝐴 ∧ 𝑧 ∈ (𝐴 ∖ 𝑦))) → (∏𝑘 ∈ 𝑦 𝐵 = (𝐵↑(♯‘𝑦)) → ∏𝑘 ∈ (𝑦 ∪ {𝑧})𝐵 = (𝐵↑(♯‘(𝑦 ∪ {𝑧}))))) |
| 46 | | simpl 109 |
. 2
⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) → 𝐴 ∈ Fin) |
| 47 | 4, 8, 12, 16, 23, 45, 46 | findcard2sd 6953 |
1
⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ ℂ) →
∏𝑘 ∈ 𝐴 𝐵 = (𝐵↑(♯‘𝐴))) |