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Mirrors > Home > MPE Home > Th. List > deg1lt0 | Structured version Visualization version GIF version |
Description: A polynomial is zero iff it has negative degree. (Contributed by Stefan O'Rear, 1-Apr-2015.) |
Ref | Expression |
---|---|
deg1z.d | ⊢ 𝐷 = ( deg1 ‘𝑅) |
deg1z.p | ⊢ 𝑃 = (Poly1‘𝑅) |
deg1z.z | ⊢ 0 = (0g‘𝑃) |
deg1nn0cl.b | ⊢ 𝐵 = (Base‘𝑃) |
Ref | Expression |
---|---|
deg1lt0 | ⊢ ((𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵) → ((𝐷‘𝐹) < 0 ↔ 𝐹 = 0 )) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | deg1z.d | . . . . . 6 ⊢ 𝐷 = ( deg1 ‘𝑅) | |
2 | deg1z.p | . . . . . 6 ⊢ 𝑃 = (Poly1‘𝑅) | |
3 | deg1z.z | . . . . . 6 ⊢ 0 = (0g‘𝑃) | |
4 | deg1nn0cl.b | . . . . . 6 ⊢ 𝐵 = (Base‘𝑃) | |
5 | 1, 2, 3, 4 | deg1nn0cl 24676 | . . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵 ∧ 𝐹 ≠ 0 ) → (𝐷‘𝐹) ∈ ℕ0) |
6 | nn0nlt0 11917 | . . . . 5 ⊢ ((𝐷‘𝐹) ∈ ℕ0 → ¬ (𝐷‘𝐹) < 0) | |
7 | 5, 6 | syl 17 | . . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵 ∧ 𝐹 ≠ 0 ) → ¬ (𝐷‘𝐹) < 0) |
8 | 7 | 3expia 1117 | . . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵) → (𝐹 ≠ 0 → ¬ (𝐷‘𝐹) < 0)) |
9 | 8 | necon4ad 3035 | . 2 ⊢ ((𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵) → ((𝐷‘𝐹) < 0 → 𝐹 = 0 )) |
10 | 1, 2, 3 | deg1z 24675 | . . . . 5 ⊢ (𝑅 ∈ Ring → (𝐷‘ 0 ) = -∞) |
11 | mnflt0 12514 | . . . . 5 ⊢ -∞ < 0 | |
12 | 10, 11 | eqbrtrdi 5097 | . . . 4 ⊢ (𝑅 ∈ Ring → (𝐷‘ 0 ) < 0) |
13 | 12 | adantr 483 | . . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵) → (𝐷‘ 0 ) < 0) |
14 | fveq2 6664 | . . . 4 ⊢ (𝐹 = 0 → (𝐷‘𝐹) = (𝐷‘ 0 )) | |
15 | 14 | breq1d 5068 | . . 3 ⊢ (𝐹 = 0 → ((𝐷‘𝐹) < 0 ↔ (𝐷‘ 0 ) < 0)) |
16 | 13, 15 | syl5ibrcom 249 | . 2 ⊢ ((𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵) → (𝐹 = 0 → (𝐷‘𝐹) < 0)) |
17 | 9, 16 | impbid 214 | 1 ⊢ ((𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵) → ((𝐷‘𝐹) < 0 ↔ 𝐹 = 0 )) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1533 ∈ wcel 2110 ≠ wne 3016 class class class wbr 5058 ‘cfv 6349 0cc0 10531 -∞cmnf 10667 < clt 10669 ℕ0cn0 11891 Basecbs 16477 0gc0g 16707 Ringcrg 19291 Poly1cpl1 20339 deg1 cdg1 24642 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-rep 5182 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 ax-addf 10610 ax-mulf 10611 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-int 4869 df-iun 4913 df-br 5059 df-opab 5121 df-mpt 5139 df-tr 5165 df-id 5454 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-se 5509 df-we 5510 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-pred 6142 df-ord 6188 df-on 6189 df-lim 6190 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-isom 6358 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-of 7403 df-om 7575 df-1st 7683 df-2nd 7684 df-supp 7825 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-oadd 8100 df-er 8283 df-map 8402 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-fsupp 8828 df-sup 8900 df-oi 8968 df-card 9362 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-nn 11633 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 df-n0 11892 df-z 11976 df-dec 12093 df-uz 12238 df-fz 12887 df-fzo 13028 df-seq 13364 df-hash 13685 df-struct 16479 df-ndx 16480 df-slot 16481 df-base 16483 df-sets 16484 df-ress 16485 df-plusg 16572 df-mulr 16573 df-starv 16574 df-sca 16575 df-vsca 16576 df-tset 16578 df-ple 16579 df-ds 16581 df-unif 16582 df-0g 16709 df-gsum 16710 df-mgm 17846 df-sgrp 17895 df-mnd 17906 df-submnd 17951 df-grp 18100 df-minusg 18101 df-subg 18270 df-cntz 18441 df-cmn 18902 df-abl 18903 df-mgp 19234 df-ur 19246 df-ring 19293 df-cring 19294 df-psr 20130 df-mpl 20132 df-opsr 20134 df-psr1 20342 df-ply1 20344 df-cnfld 20540 df-mdeg 24643 df-deg1 24644 |
This theorem is referenced by: hbtlem5 39721 |
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