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Mirrors > Home > MPE Home > Th. List > nnacda | Structured version Visualization version GIF version |
Description: The cardinal and ordinal sums of finite ordinals are equal. (Contributed by Paul Chapman, 11-Apr-2009.) (Revised by Mario Carneiro, 6-Feb-2013.) |
Ref | Expression |
---|---|
nnacda | ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (card‘(𝐴 +𝑐 𝐵)) = (𝐴 +𝑜 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnon 7305 | . . . 4 ⊢ (𝐴 ∈ ω → 𝐴 ∈ On) | |
2 | nnon 7305 | . . . 4 ⊢ (𝐵 ∈ ω → 𝐵 ∈ On) | |
3 | onacda 9307 | . . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴 +𝑜 𝐵) ≈ (𝐴 +𝑐 𝐵)) | |
4 | 1, 2, 3 | syl2an 590 | . . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 +𝑜 𝐵) ≈ (𝐴 +𝑐 𝐵)) |
5 | carden2b 9079 | . . 3 ⊢ ((𝐴 +𝑜 𝐵) ≈ (𝐴 +𝑐 𝐵) → (card‘(𝐴 +𝑜 𝐵)) = (card‘(𝐴 +𝑐 𝐵))) | |
6 | 4, 5 | syl 17 | . 2 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (card‘(𝐴 +𝑜 𝐵)) = (card‘(𝐴 +𝑐 𝐵))) |
7 | nnacl 7931 | . . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 +𝑜 𝐵) ∈ ω) | |
8 | cardnn 9075 | . . 3 ⊢ ((𝐴 +𝑜 𝐵) ∈ ω → (card‘(𝐴 +𝑜 𝐵)) = (𝐴 +𝑜 𝐵)) | |
9 | 7, 8 | syl 17 | . 2 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (card‘(𝐴 +𝑜 𝐵)) = (𝐴 +𝑜 𝐵)) |
10 | 6, 9 | eqtr3d 2835 | 1 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (card‘(𝐴 +𝑐 𝐵)) = (𝐴 +𝑜 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 385 = wceq 1653 ∈ wcel 2157 class class class wbr 4843 Oncon0 5941 ‘cfv 6101 (class class class)co 6878 ωcom 7299 +𝑜 coa 7796 ≈ cen 8192 cardccrd 9047 +𝑐 ccda 9277 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1891 ax-4 1905 ax-5 2006 ax-6 2072 ax-7 2107 ax-8 2159 ax-9 2166 ax-10 2185 ax-11 2200 ax-12 2213 ax-13 2377 ax-ext 2777 ax-rep 4964 ax-sep 4975 ax-nul 4983 ax-pow 5035 ax-pr 5097 ax-un 7183 |
This theorem depends on definitions: df-bi 199 df-an 386 df-or 875 df-3or 1109 df-3an 1110 df-tru 1657 df-ex 1876 df-nf 1880 df-sb 2065 df-mo 2591 df-eu 2609 df-clab 2786 df-cleq 2792 df-clel 2795 df-nfc 2930 df-ne 2972 df-ral 3094 df-rex 3095 df-reu 3096 df-rmo 3097 df-rab 3098 df-v 3387 df-sbc 3634 df-csb 3729 df-dif 3772 df-un 3774 df-in 3776 df-ss 3783 df-pss 3785 df-nul 4116 df-if 4278 df-pw 4351 df-sn 4369 df-pr 4371 df-tp 4373 df-op 4375 df-uni 4629 df-int 4668 df-iun 4712 df-br 4844 df-opab 4906 df-mpt 4923 df-tr 4946 df-id 5220 df-eprel 5225 df-po 5233 df-so 5234 df-fr 5271 df-we 5273 df-xp 5318 df-rel 5319 df-cnv 5320 df-co 5321 df-dm 5322 df-rn 5323 df-res 5324 df-ima 5325 df-pred 5898 df-ord 5944 df-on 5945 df-lim 5946 df-suc 5947 df-iota 6064 df-fun 6103 df-fn 6104 df-f 6105 df-f1 6106 df-fo 6107 df-f1o 6108 df-fv 6109 df-ov 6881 df-oprab 6882 df-mpt2 6883 df-om 7300 df-wrecs 7645 df-recs 7707 df-rdg 7745 df-1o 7799 df-oadd 7803 df-er 7982 df-en 8196 df-dom 8197 df-sdom 8198 df-fin 8199 df-card 9051 df-cda 9278 |
This theorem is referenced by: ackbij1lem5 9334 ackbij1lem9 9338 |
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