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Mirrors > Home > MPE Home > Th. List > oaword1 | Structured version Visualization version GIF version |
Description: An ordinal is less than or equal to its sum with another. Part of Exercise 5 of [TakeutiZaring] p. 62. Lemma 3.2 of [Schloeder] p. 7. (For the other part see oaord1 8576.) (Contributed by NM, 6-Dec-2004.) |
Ref | Expression |
---|---|
oaword1 | ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → 𝐴 ⊆ (𝐴 +o 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oa0 8541 | . . 3 ⊢ (𝐴 ∈ On → (𝐴 +o ∅) = 𝐴) | |
2 | 1 | adantr 479 | . 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴 +o ∅) = 𝐴) |
3 | 0ss 4398 | . . 3 ⊢ ∅ ⊆ 𝐵 | |
4 | 0elon 6426 | . . . 4 ⊢ ∅ ∈ On | |
5 | oaword 8574 | . . . . 5 ⊢ ((∅ ∈ On ∧ 𝐵 ∈ On ∧ 𝐴 ∈ On) → (∅ ⊆ 𝐵 ↔ (𝐴 +o ∅) ⊆ (𝐴 +o 𝐵))) | |
6 | 5 | 3com13 1121 | . . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ ∅ ∈ On) → (∅ ⊆ 𝐵 ↔ (𝐴 +o ∅) ⊆ (𝐴 +o 𝐵))) |
7 | 4, 6 | mp3an3 1446 | . . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (∅ ⊆ 𝐵 ↔ (𝐴 +o ∅) ⊆ (𝐴 +o 𝐵))) |
8 | 3, 7 | mpbii 232 | . 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴 +o ∅) ⊆ (𝐴 +o 𝐵)) |
9 | 2, 8 | eqsstrrd 4019 | 1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → 𝐴 ⊆ (𝐴 +o 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 = wceq 1533 ∈ wcel 2098 ⊆ wss 3947 ∅c0 4324 Oncon0 6372 (class class class)co 7424 +o coa 8488 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2698 ax-rep 5287 ax-sep 5301 ax-nul 5308 ax-pr 5431 ax-un 7744 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2937 df-ral 3058 df-rex 3067 df-reu 3373 df-rab 3429 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4325 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4911 df-iun 5000 df-br 5151 df-opab 5213 df-mpt 5234 df-tr 5268 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5635 df-we 5637 df-xp 5686 df-rel 5687 df-cnv 5688 df-co 5689 df-dm 5690 df-rn 5691 df-res 5692 df-ima 5693 df-pred 6308 df-ord 6375 df-on 6376 df-lim 6377 df-suc 6378 df-iota 6503 df-fun 6553 df-fn 6554 df-f 6555 df-f1 6556 df-fo 6557 df-f1o 6558 df-fv 6559 df-ov 7427 df-oprab 7428 df-mpo 7429 df-om 7875 df-2nd 7998 df-frecs 8291 df-wrecs 8322 df-recs 8396 df-rdg 8435 df-oadd 8495 |
This theorem is referenced by: oawordexr 8581 oa00 8584 oaf1o 8588 omordi 8591 omeulem2 8608 oeeui 8627 nnarcl 8641 omxpenlem 9102 cantnfle 9700 cantnflem1d 9717 cantnflem3 9720 cantnflem4 9721 tfsconcatfn 42770 tfsconcatfv2 42772 tfsconcatrn 42774 tfsconcat0b 42778 tfsconcatrev 42780 oadif1 42812 oaun2 42813 oaun3 42814 naddwordnexlem0 42829 naddwordnexlem4 42834 |
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