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Description: Lemma for ply1term . (Contributed by Mario Carneiro, 26-Jul-2014)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | ply1term.1 | ⊢ 𝐹 = ( 𝑧 ∈ ℂ ↦ ( 𝐴 · ( 𝑧 ↑ 𝑁 ) ) ) | |
| Assertion | ply1termlem | ⊢ ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) → 𝐹 = ( 𝑧 ∈ ℂ ↦ Σ 𝑘 ∈ ( 0 ... 𝑁 ) ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ply1term.1 | ⊢ 𝐹 = ( 𝑧 ∈ ℂ ↦ ( 𝐴 · ( 𝑧 ↑ 𝑁 ) ) ) | |
| 2 | simplr | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → 𝑁 ∈ ℕ0 ) | |
| 3 | nn0uz | ⊢ ℕ0 = ( ℤ≥ ‘ 0 ) | |
| 4 | 2 3 | eleqtrdi | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → 𝑁 ∈ ( ℤ≥ ‘ 0 ) ) |
| 5 | fzss1 | ⊢ ( 𝑁 ∈ ( ℤ≥ ‘ 0 ) → ( 𝑁 ... 𝑁 ) ⊆ ( 0 ... 𝑁 ) ) | |
| 6 | 4 5 | syl | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → ( 𝑁 ... 𝑁 ) ⊆ ( 0 ... 𝑁 ) ) |
| 7 | elfz1eq | ⊢ ( 𝑘 ∈ ( 𝑁 ... 𝑁 ) → 𝑘 = 𝑁 ) | |
| 8 | 7 | adantl | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) → 𝑘 = 𝑁 ) |
| 9 | iftrue | ⊢ ( 𝑘 = 𝑁 → if ( 𝑘 = 𝑁 , 𝐴 , 0 ) = 𝐴 ) | |
| 10 | 8 9 | syl | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) → if ( 𝑘 = 𝑁 , 𝐴 , 0 ) = 𝐴 ) |
| 11 | simpll | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → 𝐴 ∈ ℂ ) | |
| 12 | 11 | adantr | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) → 𝐴 ∈ ℂ ) |
| 13 | 10 12 | eqeltrd | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) → if ( 𝑘 = 𝑁 , 𝐴 , 0 ) ∈ ℂ ) |
| 14 | simplr | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) → 𝑧 ∈ ℂ ) | |
| 15 | 2 | adantr | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) → 𝑁 ∈ ℕ0 ) |
| 16 | 8 15 | eqeltrd | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) → 𝑘 ∈ ℕ0 ) |
| 17 | 14 16 | expcld | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) → ( 𝑧 ↑ 𝑘 ) ∈ ℂ ) |
| 18 | 13 17 | mulcld | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) → ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) ∈ ℂ ) |
| 19 | eldifn | ⊢ ( 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) → ¬ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) | |
| 20 | 19 | adantl | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → ¬ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ) |
| 21 | 2 | adantr | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → 𝑁 ∈ ℕ0 ) |
| 22 | 21 | nn0zd | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → 𝑁 ∈ ℤ ) |
| 23 | fzsn | ⊢ ( 𝑁 ∈ ℤ → ( 𝑁 ... 𝑁 ) = { 𝑁 } ) | |
| 24 | 23 | eleq2d | ⊢ ( 𝑁 ∈ ℤ → ( 𝑘 ∈ ( 𝑁 ... 𝑁 ) ↔ 𝑘 ∈ { 𝑁 } ) ) |
| 25 | elsn2g | ⊢ ( 𝑁 ∈ ℤ → ( 𝑘 ∈ { 𝑁 } ↔ 𝑘 = 𝑁 ) ) | |
| 26 | 24 25 | bitrd | ⊢ ( 𝑁 ∈ ℤ → ( 𝑘 ∈ ( 𝑁 ... 𝑁 ) ↔ 𝑘 = 𝑁 ) ) |
| 27 | 22 26 | syl | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → ( 𝑘 ∈ ( 𝑁 ... 𝑁 ) ↔ 𝑘 = 𝑁 ) ) |
| 28 | 20 27 | mtbid | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → ¬ 𝑘 = 𝑁 ) |
| 29 | 28 | iffalsed | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → if ( 𝑘 = 𝑁 , 𝐴 , 0 ) = 0 ) |
| 30 | 29 | oveq1d | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) = ( 0 · ( 𝑧 ↑ 𝑘 ) ) ) |
| 31 | simpr | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → 𝑧 ∈ ℂ ) | |
| 32 | eldifi | ⊢ ( 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) → 𝑘 ∈ ( 0 ... 𝑁 ) ) | |
| 33 | elfznn0 | ⊢ ( 𝑘 ∈ ( 0 ... 𝑁 ) → 𝑘 ∈ ℕ0 ) | |
| 34 | 32 33 | syl | ⊢ ( 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) → 𝑘 ∈ ℕ0 ) |
| 35 | expcl | ⊢ ( ( 𝑧 ∈ ℂ ∧ 𝑘 ∈ ℕ0 ) → ( 𝑧 ↑ 𝑘 ) ∈ ℂ ) | |
| 36 | 31 34 35 | syl2an | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → ( 𝑧 ↑ 𝑘 ) ∈ ℂ ) |
| 37 | 36 | mul02d | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → ( 0 · ( 𝑧 ↑ 𝑘 ) ) = 0 ) |
| 38 | 30 37 | eqtrd | ⊢ ( ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) ∧ 𝑘 ∈ ( ( 0 ... 𝑁 ) ∖ ( 𝑁 ... 𝑁 ) ) ) → ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) = 0 ) |
| 39 | fzfid | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → ( 0 ... 𝑁 ) ∈ Fin ) | |
| 40 | 6 18 38 39 | fsumss | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → Σ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) = Σ 𝑘 ∈ ( 0 ... 𝑁 ) ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) ) |
| 41 | 2 | nn0zd | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → 𝑁 ∈ ℤ ) |
| 42 | 31 2 | expcld | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → ( 𝑧 ↑ 𝑁 ) ∈ ℂ ) |
| 43 | 11 42 | mulcld | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → ( 𝐴 · ( 𝑧 ↑ 𝑁 ) ) ∈ ℂ ) |
| 44 | oveq2 | ⊢ ( 𝑘 = 𝑁 → ( 𝑧 ↑ 𝑘 ) = ( 𝑧 ↑ 𝑁 ) ) | |
| 45 | 9 44 | oveq12d | ⊢ ( 𝑘 = 𝑁 → ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) = ( 𝐴 · ( 𝑧 ↑ 𝑁 ) ) ) |
| 46 | 45 | fsum1 | ⊢ ( ( 𝑁 ∈ ℤ ∧ ( 𝐴 · ( 𝑧 ↑ 𝑁 ) ) ∈ ℂ ) → Σ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) = ( 𝐴 · ( 𝑧 ↑ 𝑁 ) ) ) |
| 47 | 41 43 46 | syl2anc | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → Σ 𝑘 ∈ ( 𝑁 ... 𝑁 ) ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) = ( 𝐴 · ( 𝑧 ↑ 𝑁 ) ) ) |
| 48 | 40 47 | eqtr3d | ⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) ∧ 𝑧 ∈ ℂ ) → Σ 𝑘 ∈ ( 0 ... 𝑁 ) ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) = ( 𝐴 · ( 𝑧 ↑ 𝑁 ) ) ) |
| 49 | 48 | mpteq2dva | ⊢ ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) → ( 𝑧 ∈ ℂ ↦ Σ 𝑘 ∈ ( 0 ... 𝑁 ) ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) ) = ( 𝑧 ∈ ℂ ↦ ( 𝐴 · ( 𝑧 ↑ 𝑁 ) ) ) ) |
| 50 | 1 49 | eqtr4id | ⊢ ( ( 𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ0 ) → 𝐹 = ( 𝑧 ∈ ℂ ↦ Σ 𝑘 ∈ ( 0 ... 𝑁 ) ( if ( 𝑘 = 𝑁 , 𝐴 , 0 ) · ( 𝑧 ↑ 𝑘 ) ) ) ) |