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Mirrors > Home > MPE Home > Th. List > 3onn | Structured version Visualization version GIF version |
Description: The ordinal 3 is a natural number. (Contributed by Mario Carneiro, 5-Jan-2016.) |
Ref | Expression |
---|---|
3onn | ⊢ 3o ∈ ω |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-3o 8098 | . 2 ⊢ 3o = suc 2o | |
2 | 2onn 8260 | . . 3 ⊢ 2o ∈ ω | |
3 | peano2 7596 | . . 3 ⊢ (2o ∈ ω → suc 2o ∈ ω) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ suc 2o ∈ ω |
5 | 1, 4 | eqeltri 2909 | 1 ⊢ 3o ∈ ω |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2110 suc csuc 6188 ωcom 7574 2oc2o 8090 3oc3o 8091 |
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 2156 ax-12 2172 ax-ext 2793 ax-sep 5196 ax-nul 5203 ax-pr 5322 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-rab 3147 df-v 3497 df-sbc 3773 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4562 df-pr 4564 df-tp 4566 df-op 4568 df-uni 4833 df-br 5060 df-opab 5122 df-tr 5166 df-eprel 5460 df-po 5469 df-so 5470 df-fr 5509 df-we 5511 df-ord 6189 df-on 6190 df-lim 6191 df-suc 6192 df-om 7575 df-1o 8096 df-2o 8097 df-3o 8098 |
This theorem is referenced by: 4onn 8262 en4 8750 hash4 13762 hash3tr 13842 |
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