Theorem nnm2 8270

Description: Multiply an element of ω by 2_o. (Contributed by Scott Fenton, 18-Apr-2012.) (Revised by Mario Carneiro, 17-Nov-2014.)

Assertion

Ref	Expression
nnm2	⊢ (𝐴 ∈ ω → (𝐴 ·o 2o) = (𝐴 +o 𝐴))

Proof of Theorem nnm2

Step	Hyp	Ref	Expression
1		df-2o 8097	. . 3 ⊢ 2o = suc 1o
2	1	oveq2i 7161	. 2 ⊢ (𝐴 ·o 2o) = (𝐴 ·o suc 1o)
3		1onn 8259	. . . 4 ⊢ 1o ∈ ω
4		nnmsuc 8227	. . . 4 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ ω) → (𝐴 ·o suc 1o) = ((𝐴 ·o 1o) +o 𝐴))
5	3, 4	mpan2 689	. . 3 ⊢ (𝐴 ∈ ω → (𝐴 ·o suc 1o) = ((𝐴 ·o 1o) +o 𝐴))
6		nnm1 8269	. . . 4 ⊢ (𝐴 ∈ ω → (𝐴 ·o 1o) = 𝐴)
7	6	oveq1d 7165	. . 3 ⊢ (𝐴 ∈ ω → ((𝐴 ·o 1o) +o 𝐴) = (𝐴 +o 𝐴))
8	5, 7	eqtrd 2856	. 2 ⊢ (𝐴 ∈ ω → (𝐴 ·o suc 1o) = (𝐴 +o 𝐴))
9	2, 8	syl5eq 2868	1 ⊢ (𝐴 ∈ ω → (𝐴 ·o 2o) = (𝐴 +o 𝐴))

Syntax hints:   → wi 4   = wceq 1533   ∈ wcel 2110  suc csuc 6187  (class class class)co 7150  ωcom 7574  1_oc1o 8089  2_oc2o 8090   +_o coa 8093   ·_o comu 8094

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-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321  ax-un 7455

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-ral 3143  df-rex 3144  df-reu 3145  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-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-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-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7575  df-wrecs 7941  df-recs 8002  df-rdg 8040  df-1o 8096  df-2o 8097  df-oadd 8100  df-omul 8101

This theorem is referenced by:  nn2m  8271  omopthlem1  8276  omopthlem2  8277