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Mirrors > Home > MPE Home > Th. List > 0dgr | Structured version Visualization version GIF version |
Description: A constant function has degree 0. (Contributed by Mario Carneiro, 24-Jul-2014.) |
Ref | Expression |
---|---|
0dgr | ⊢ (𝐴 ∈ ℂ → (deg‘(ℂ × {𝐴})) = 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssid 3991 | . . . 4 ⊢ ℂ ⊆ ℂ | |
2 | plyconst 24798 | . . . 4 ⊢ ((ℂ ⊆ ℂ ∧ 𝐴 ∈ ℂ) → (ℂ × {𝐴}) ∈ (Poly‘ℂ)) | |
3 | 1, 2 | mpan 688 | . . 3 ⊢ (𝐴 ∈ ℂ → (ℂ × {𝐴}) ∈ (Poly‘ℂ)) |
4 | 0nn0 11915 | . . . 4 ⊢ 0 ∈ ℕ0 | |
5 | 4 | a1i 11 | . . 3 ⊢ (𝐴 ∈ ℂ → 0 ∈ ℕ0) |
6 | simpl 485 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ (0...0)) → 𝐴 ∈ ℂ) | |
7 | 0z 11995 | . . . . . . 7 ⊢ 0 ∈ ℤ | |
8 | exp0 13436 | . . . . . . . . . 10 ⊢ (𝑧 ∈ ℂ → (𝑧↑0) = 1) | |
9 | 8 | oveq2d 7174 | . . . . . . . . 9 ⊢ (𝑧 ∈ ℂ → (𝐴 · (𝑧↑0)) = (𝐴 · 1)) |
10 | mulid1 10641 | . . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → (𝐴 · 1) = 𝐴) | |
11 | 9, 10 | sylan9eqr 2880 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑧 ∈ ℂ) → (𝐴 · (𝑧↑0)) = 𝐴) |
12 | simpl 485 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑧 ∈ ℂ) → 𝐴 ∈ ℂ) | |
13 | 11, 12 | eqeltrd 2915 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑧 ∈ ℂ) → (𝐴 · (𝑧↑0)) ∈ ℂ) |
14 | oveq2 7166 | . . . . . . . . 9 ⊢ (𝑘 = 0 → (𝑧↑𝑘) = (𝑧↑0)) | |
15 | 14 | oveq2d 7174 | . . . . . . . 8 ⊢ (𝑘 = 0 → (𝐴 · (𝑧↑𝑘)) = (𝐴 · (𝑧↑0))) |
16 | 15 | fsum1 15104 | . . . . . . 7 ⊢ ((0 ∈ ℤ ∧ (𝐴 · (𝑧↑0)) ∈ ℂ) → Σ𝑘 ∈ (0...0)(𝐴 · (𝑧↑𝑘)) = (𝐴 · (𝑧↑0))) |
17 | 7, 13, 16 | sylancr 589 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑧 ∈ ℂ) → Σ𝑘 ∈ (0...0)(𝐴 · (𝑧↑𝑘)) = (𝐴 · (𝑧↑0))) |
18 | 17, 11 | eqtrd 2858 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑧 ∈ ℂ) → Σ𝑘 ∈ (0...0)(𝐴 · (𝑧↑𝑘)) = 𝐴) |
19 | 18 | mpteq2dva 5163 | . . . 4 ⊢ (𝐴 ∈ ℂ → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...0)(𝐴 · (𝑧↑𝑘))) = (𝑧 ∈ ℂ ↦ 𝐴)) |
20 | fconstmpt 5616 | . . . 4 ⊢ (ℂ × {𝐴}) = (𝑧 ∈ ℂ ↦ 𝐴) | |
21 | 19, 20 | syl6reqr 2877 | . . 3 ⊢ (𝐴 ∈ ℂ → (ℂ × {𝐴}) = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...0)(𝐴 · (𝑧↑𝑘)))) |
22 | 3, 5, 6, 21 | dgrle 24835 | . 2 ⊢ (𝐴 ∈ ℂ → (deg‘(ℂ × {𝐴})) ≤ 0) |
23 | dgrcl 24825 | . . 3 ⊢ ((ℂ × {𝐴}) ∈ (Poly‘ℂ) → (deg‘(ℂ × {𝐴})) ∈ ℕ0) | |
24 | nn0le0eq0 11928 | . . 3 ⊢ ((deg‘(ℂ × {𝐴})) ∈ ℕ0 → ((deg‘(ℂ × {𝐴})) ≤ 0 ↔ (deg‘(ℂ × {𝐴})) = 0)) | |
25 | 3, 23, 24 | 3syl 18 | . 2 ⊢ (𝐴 ∈ ℂ → ((deg‘(ℂ × {𝐴})) ≤ 0 ↔ (deg‘(ℂ × {𝐴})) = 0)) |
26 | 22, 25 | mpbid 234 | 1 ⊢ (𝐴 ∈ ℂ → (deg‘(ℂ × {𝐴})) = 0) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ⊆ wss 3938 {csn 4569 class class class wbr 5068 ↦ cmpt 5148 × cxp 5555 ‘cfv 6357 (class class class)co 7158 ℂcc 10537 0cc0 10539 1c1 10540 · cmul 10544 ≤ cle 10678 ℕ0cn0 11900 ℤcz 11984 ...cfz 12895 ↑cexp 13432 Σcsu 15044 Polycply 24776 degcdgr 24779 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-rep 5192 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-inf2 9106 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 ax-pre-sup 10617 ax-addf 10618 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-fal 1550 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-int 4879 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-se 5517 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-isom 6366 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-of 7411 df-om 7583 df-1st 7691 df-2nd 7692 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-1o 8104 df-oadd 8108 df-er 8291 df-map 8410 df-pm 8411 df-en 8512 df-dom 8513 df-sdom 8514 df-fin 8515 df-sup 8908 df-inf 8909 df-oi 8976 df-card 9370 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-div 11300 df-nn 11641 df-2 11703 df-3 11704 df-n0 11901 df-z 11985 df-uz 12247 df-rp 12393 df-fz 12896 df-fzo 13037 df-fl 13165 df-seq 13373 df-exp 13433 df-hash 13694 df-cj 14460 df-re 14461 df-im 14462 df-sqrt 14596 df-abs 14597 df-clim 14847 df-rlim 14848 df-sum 15045 df-0p 24273 df-ply 24780 df-coe 24782 df-dgr 24783 |
This theorem is referenced by: 0dgrb 24838 coemulc 24847 dgr0 24854 dgrmulc 24863 dgrcolem2 24866 plyremlem 24895 vieta1lem2 24902 |
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