Theorem nq0m0r 7767

Description: Multiplication with zero for nonnegative fractions. (Contributed by Jim Kingdon, 5-Nov-2019.)

Assertion

Ref	Expression
nq0m0r	⊢ (𝐴 ∈ Q0 → (0Q0 ·Q0 𝐴) = 0Q0)

Proof of Theorem nq0m0r

Dummy variables 𝑣 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nq0nn 7753	. 2 ⊢ (𝐴 ∈ Q0 → ∃𝑤∃𝑣((𝑤 ∈ ω ∧ 𝑣 ∈ N) ∧ 𝐴 = [⟨𝑤, 𝑣⟩] ~Q0 ))
2		df-0nq0 7737	. . . . . 6 ⊢ 0Q0 = [⟨∅, 1o⟩] ~Q0
3		oveq12 6058	. . . . . 6 ⊢ ((0Q0 = [⟨∅, 1o⟩] ~Q0 ∧ 𝐴 = [⟨𝑤, 𝑣⟩] ~Q0 ) → (0Q0 ·Q0 𝐴) = ([⟨∅, 1o⟩] ~Q0 ·Q0 [⟨𝑤, 𝑣⟩] ~Q0 ))
4	2, 3	mpan 424	. . . . 5 ⊢ (𝐴 = [⟨𝑤, 𝑣⟩] ~Q0 → (0Q0 ·Q0 𝐴) = ([⟨∅, 1o⟩] ~Q0 ·Q0 [⟨𝑤, 𝑣⟩] ~Q0 ))
5		peano1 4715	. . . . . 6 ⊢ ∅ ∈ ω
6		1pi 7626	. . . . . 6 ⊢ 1o ∈ N
7		mulnnnq0 7761	. . . . . 6 ⊢ (((∅ ∈ ω ∧ 1o ∈ N) ∧ (𝑤 ∈ ω ∧ 𝑣 ∈ N)) → ([⟨∅, 1o⟩] ~Q0 ·Q0 [⟨𝑤, 𝑣⟩] ~Q0 ) = [⟨(∅ ·o 𝑤), (1o ·o 𝑣)⟩] ~Q0 )
8	5, 6, 7	mpanl12 436	. . . . 5 ⊢ ((𝑤 ∈ ω ∧ 𝑣 ∈ N) → ([⟨∅, 1o⟩] ~Q0 ·Q0 [⟨𝑤, 𝑣⟩] ~Q0 ) = [⟨(∅ ·o 𝑤), (1o ·o 𝑣)⟩] ~Q0 )
9	4, 8	sylan9eqr 2287	. . . 4 ⊢ (((𝑤 ∈ ω ∧ 𝑣 ∈ N) ∧ 𝐴 = [⟨𝑤, 𝑣⟩] ~Q0 ) → (0Q0 ·Q0 𝐴) = [⟨(∅ ·o 𝑤), (1o ·o 𝑣)⟩] ~Q0 )
10		nnm0r 6711	. . . . . . . . . . 11 ⊢ (𝑤 ∈ ω → (∅ ·o 𝑤) = ∅)
11	10	oveq1d 6064	. . . . . . . . . 10 ⊢ (𝑤 ∈ ω → ((∅ ·o 𝑤) ·o 1o) = (∅ ·o 1o))
12		1onn 6752	. . . . . . . . . . 11 ⊢ 1o ∈ ω
13		nnm0r 6711	. . . . . . . . . . 11 ⊢ (1o ∈ ω → (∅ ·o 1o) = ∅)
14	12, 13	ax-mp 5	. . . . . . . . . 10 ⊢ (∅ ·o 1o) = ∅
15	11, 14	eqtrdi 2281	. . . . . . . . 9 ⊢ (𝑤 ∈ ω → ((∅ ·o 𝑤) ·o 1o) = ∅)
16	15	adantr 276	. . . . . . . 8 ⊢ ((𝑤 ∈ ω ∧ 𝑣 ∈ N) → ((∅ ·o 𝑤) ·o 1o) = ∅)
17		mulpiord 7628	. . . . . . . . . . . 12 ⊢ ((1o ∈ N ∧ 𝑣 ∈ N) → (1o ·N 𝑣) = (1o ·o 𝑣))
18		mulclpi 7639	. . . . . . . . . . . 12 ⊢ ((1o ∈ N ∧ 𝑣 ∈ N) → (1o ·N 𝑣) ∈ N)
19	17, 18	eqeltrrd 2310	. . . . . . . . . . 11 ⊢ ((1o ∈ N ∧ 𝑣 ∈ N) → (1o ·o 𝑣) ∈ N)
20	6, 19	mpan 424	. . . . . . . . . 10 ⊢ (𝑣 ∈ N → (1o ·o 𝑣) ∈ N)
21		pinn 7620	. . . . . . . . . 10 ⊢ ((1o ·o 𝑣) ∈ N → (1o ·o 𝑣) ∈ ω)
22		nnm0 6707	. . . . . . . . . 10 ⊢ ((1o ·o 𝑣) ∈ ω → ((1o ·o 𝑣) ·o ∅) = ∅)
23	20, 21, 22	3syl 17	. . . . . . . . 9 ⊢ (𝑣 ∈ N → ((1o ·o 𝑣) ·o ∅) = ∅)
24	23	adantl 277	. . . . . . . 8 ⊢ ((𝑤 ∈ ω ∧ 𝑣 ∈ N) → ((1o ·o 𝑣) ·o ∅) = ∅)
25	16, 24	eqtr4d 2268	. . . . . . 7 ⊢ ((𝑤 ∈ ω ∧ 𝑣 ∈ N) → ((∅ ·o 𝑤) ·o 1o) = ((1o ·o 𝑣) ·o ∅))
26	10, 5	eqeltrdi 2323	. . . . . . . 8 ⊢ (𝑤 ∈ ω → (∅ ·o 𝑤) ∈ ω)
27		enq0eceq 7748	. . . . . . . . 9 ⊢ ((((∅ ·o 𝑤) ∈ ω ∧ (1o ·o 𝑣) ∈ N) ∧ (∅ ∈ ω ∧ 1o ∈ N)) → ([⟨(∅ ·o 𝑤), (1o ·o 𝑣)⟩] ~Q0 = [⟨∅, 1o⟩] ~Q0 ↔ ((∅ ·o 𝑤) ·o 1o) = ((1o ·o 𝑣) ·o ∅)))
28	5, 6, 27	mpanr12 439	. . . . . . . 8 ⊢ (((∅ ·o 𝑤) ∈ ω ∧ (1o ·o 𝑣) ∈ N) → ([⟨(∅ ·o 𝑤), (1o ·o 𝑣)⟩] ~Q0 = [⟨∅, 1o⟩] ~Q0 ↔ ((∅ ·o 𝑤) ·o 1o) = ((1o ·o 𝑣) ·o ∅)))
29	26, 20, 28	syl2an 289	. . . . . . 7 ⊢ ((𝑤 ∈ ω ∧ 𝑣 ∈ N) → ([⟨(∅ ·o 𝑤), (1o ·o 𝑣)⟩] ~Q0 = [⟨∅, 1o⟩] ~Q0 ↔ ((∅ ·o 𝑤) ·o 1o) = ((1o ·o 𝑣) ·o ∅)))
30	25, 29	mpbird 167	. . . . . 6 ⊢ ((𝑤 ∈ ω ∧ 𝑣 ∈ N) → [⟨(∅ ·o 𝑤), (1o ·o 𝑣)⟩] ~Q0 = [⟨∅, 1o⟩] ~Q0 )
31	30, 2	eqtr4di 2283	. . . . 5 ⊢ ((𝑤 ∈ ω ∧ 𝑣 ∈ N) → [⟨(∅ ·o 𝑤), (1o ·o 𝑣)⟩] ~Q0 = 0Q0)
32	31	adantr 276	. . . 4 ⊢ (((𝑤 ∈ ω ∧ 𝑣 ∈ N) ∧ 𝐴 = [⟨𝑤, 𝑣⟩] ~Q0 ) → [⟨(∅ ·o 𝑤), (1o ·o 𝑣)⟩] ~Q0 = 0Q0)
33	9, 32	eqtrd 2265	. . 3 ⊢ (((𝑤 ∈ ω ∧ 𝑣 ∈ N) ∧ 𝐴 = [⟨𝑤, 𝑣⟩] ~Q0 ) → (0Q0 ·Q0 𝐴) = 0Q0)
34	33	exlimivv 1946	. 2 ⊢ (∃𝑤∃𝑣((𝑤 ∈ ω ∧ 𝑣 ∈ N) ∧ 𝐴 = [⟨𝑤, 𝑣⟩] ~Q0 ) → (0Q0 ·Q0 𝐴) = 0Q0)
35	1, 34	syl 14	1 ⊢ (𝐴 ∈ Q0 → (0Q0 ·Q0 𝐴) = 0Q0)

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1398  ∃wex 1541   ∈ wcel 2203  ∅c0 3507  ⟨cop 3691  ωcom 4711  (class class class)co 6049  1_oc1o 6639   ·_o comu 6644  [cec 6764  Ncnpi 7583   ·_N cmi 7585   ~_Q0 ceq0 7597  Q₀cnq0 7598  0_Q0c0q0 7599   ·_Q0 cmq0 7601

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-coll 4224  ax-sep 4227  ax-nul 4235  ax-pow 4286  ax-pr 4321  ax-un 4553  ax-setind 4658  ax-iinf 4709

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2814  df-sbc 3042  df-csb 3138  df-dif 3212  df-un 3214  df-in 3216  df-ss 3223  df-nul 3508  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-uni 3914  df-int 3949  df-iun 3992  df-br 4109  df-opab 4171  df-mpt 4172  df-tr 4208  df-id 4413  df-iord 4486  df-on 4488  df-suc 4491  df-iom 4712  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-rn 4759  df-res 4760  df-ima 4761  df-iota 5311  df-fun 5353  df-fn 5354  df-f 5355  df-f1 5356  df-fo 5357  df-f1o 5358  df-fv 5359  df-ov 6052  df-oprab 6053  df-mpo 6054  df-1st 6333  df-2nd 6334  df-recs 6535  df-irdg 6600  df-1o 6646  df-oadd 6650  df-omul 6651  df-er 6766  df-ec 6768  df-qs 6772  df-ni 7615  df-mi 7617  df-enq0 7735  df-nq0 7736  df-0nq0 7737  df-mq0 7739

This theorem is referenced by:  prarloclem5  7811