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| Mirrors > Home > ILE Home > Th. List > nnord | GIF version | ||
| Description: A natural number is ordinal. (Contributed by NM, 17-Oct-1995.) |
| Ref | Expression |
|---|---|
| nnord | ⊢ (𝐴 ∈ ω → Ord 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnon 4737 | . 2 ⊢ (𝐴 ∈ ω → 𝐴 ∈ On) | |
| 2 | eloni 4501 | . 2 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝐴 ∈ ω → Ord 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2205 Ord word 4488 Oncon0 4489 ωcom 4717 |
| 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 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-nul 4241 ax-pow 4292 ax-pr 4327 ax-un 4559 ax-iinf 4715 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ral 2527 df-rex 2528 df-v 2817 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-nul 3513 df-pw 3676 df-sn 3700 df-pr 3701 df-uni 3920 df-int 3955 df-tr 4214 df-iord 4492 df-on 4494 df-suc 4497 df-iom 4718 |
| This theorem is referenced by: nnsucsssuc 6738 nnsucuniel 6741 nntri1 6742 nnsseleq 6747 nntr2 6749 phplem1 7119 phplem2 7120 phplem3 7121 phplem4 7122 phplem4dom 7129 nndomo 7131 1ndom2 7132 dif1en 7149 nnwetri 7189 unsnfi 7192 ctmlemr 7412 nnnninf 7430 nnnninfeq 7432 nnnninfeq2 7433 nninfisol 7437 piord 7642 addnidpig 7667 archnqq 7748 frecfzennn 10812 hashp1i 11200 ennnfonelemk 13235 ennnfonelemg 13238 ennnfonelemhf1o 13248 ennnfonelemhom 13250 ctinfom 13263 3dom 16888 nnsf 16909 peano4nninf 16910 nninfsellemeq 16918 nnnninfex 16926 |
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