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Theorem mplbas 22033

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 4103	. . 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 2740	. . . . 5 ⊢ {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 } = {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 }
8	3, 4, 5, 6, 7	mplval 22032	. . . 4 ⊢ 𝑃 = (𝑆 ↾_s {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 })
9	8, 5	ressbas2 17296	. . 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 2771	1 ⊢ 𝑈 = {𝑓 ∈ 𝐵 ∣ 𝑓 finSupp 0 }

Colors of variables: wff setvar class

Syntax hints: = wceq 1537 {crab 3443 ⊆ wss 3976 class class class wbr 5166 ‘cfv 6573 (class class class)co 7448 finSupp cfsupp 9431 Basecbs 17258 0_gc0g 17499 mPwSer cmps 21947 mPoly cmpl 21949

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2158 ax-12 2178 ax-ext 2711 ax-sep 5317 ax-nul 5324 ax-pow 5383 ax-pr 5447 ax-un 7770 ax-cnex 11240 ax-1cn 11242 ax-addcl 11244

This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3or 1088 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2065 df-mo 2543 df-eu 2572 df-clab 2718 df-cleq 2732 df-clel 2819 df-nfc 2895 df-ne 2947 df-ral 3068 df-rex 3077 df-reu 3389 df-rab 3444 df-v 3490 df-sbc 3805 df-csb 3922 df-dif 3979 df-un 3981 df-in 3983 df-ss 3993 df-pss 3996 df-nul 4353 df-if 4549 df-pw 4624 df-sn 4649 df-pr 4651 df-op 4655 df-uni 4932 df-iun 5017 df-br 5167 df-opab 5229 df-mpt 5250 df-tr 5284 df-id 5593 df-eprel 5599 df-po 5607 df-so 5608 df-fr 5652 df-we 5654 df-xp 5706 df-rel 5707 df-cnv 5708 df-co 5709 df-dm 5710 df-rn 5711 df-res 5712 df-ima 5713 df-pred 6332 df-ord 6398 df-on 6399 df-lim 6400 df-suc 6401 df-iota 6525 df-fun 6575 df-fn 6576 df-f 6577 df-f1 6578 df-fo 6579 df-f1o 6580 df-fv 6581 df-ov 7451 df-oprab 7452 df-mpo 7453 df-om 7904 df-2nd 8031 df-frecs 8322 df-wrecs 8353 df-recs 8427 df-rdg 8466 df-nn 12294 df-sets 17211 df-slot 17229 df-ndx 17241 df-base 17259 df-ress 17288 df-psr 21952 df-mpl 21954

This theorem is referenced by: mplelbas 22034 mplval2 22039 mplbasss 22040 mplsubglem2 22044 ressmplbas2 22068 mplbaspropd 22259

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