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Theorem mplbas 22010

Description: Base set of the set of multivariate polynomials. (Contributed by Mario Carneiro, 7-Jan-2015.) (Revised by Mario Carneiro, 2-Oct-2015.) (Revised by AV, 25-Jun-2019.)

**Hypotheses**
Ref	Expression
mplval.p	⊢ 𝑃 = (𝐼 mPoly 𝑅)
mplval.s	⊢ 𝑆 = (𝐼 mPwSer 𝑅)
mplval.b	⊢ 𝐵 = (Base‘𝑆)
mplval.z	⊢ 0 = (0_g‘𝑅)
mplbas.u	⊢ 𝑈 = (Base‘𝑃)

**Assertion**
Ref	Expression
mplbas	⊢ 𝑈 = {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 }

Distinct variable groups: 𝐵,𝑓 𝑓,𝐼 𝑅,𝑓 0 ,𝑓 Allowed substitution hints: 𝑃(𝑓) 𝑆(𝑓) 𝑈(𝑓)

**Proof of Theorem mplbas**
Step	Hyp	Ref	Expression
1		mplbas.u	. 2 ⊢ 𝑈 = (Base‘𝑃)
2		ssrab2 4080	. . 3 ⊢ {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 } ⊆ 𝐵
3		mplval.p	. . . . 5 ⊢ 𝑃 = (𝐼 mPoly 𝑅)
4		mplval.s	. . . . 5 ⊢ 𝑆 = (𝐼 mPwSer 𝑅)
5		mplval.b	. . . . 5 ⊢ 𝐵 = (Base‘𝑆)
6		mplval.z	. . . . 5 ⊢ 0 = (0_g‘𝑅)
7		eqid 2737	. . . . 5 ⊢ {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 } = {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 }
8	3, 4, 5, 6, 7	mplval 22009	. . . 4 ⊢ 𝑃 = (𝑆 ↾_s {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 })
9	8, 5	ressbas2 17283	. . 3 ⊢ ({𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 } ⊆ 𝐵 → {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 } = (Base‘𝑃))
10	2, 9	ax-mp 5	. 2 ⊢ {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 } = (Base‘𝑃)
11	1, 10	eqtr4i 2768	1 ⊢ 𝑈 = {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 }

Colors of variables: wff setvar class

Syntax hints: = wceq 1540 {crab 3436 ⊆ wss 3951 class class class wbr 5143 ‘cfv 6561 (class class class)co 7431 finSupp cfsupp 9401 Basecbs 17247 0_gc0g 17484 mPwSer cmps 21924 mPoly cmpl 21926

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 ax-cnex 11211 ax-1cn 11213 ax-addcl 11215

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-nn 12267 df-sets 17201 df-slot 17219 df-ndx 17231 df-base 17248 df-ress 17275 df-psr 21929 df-mpl 21931

This theorem is referenced by: mplelbas 22011 mplval2 22016 mplbasss 22017 mplsubglem2 22021 ressmplbas2 22045 mplbaspropd 22238

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