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Related theorems GIF version |
| Description: A set is dominated by its cardinal sum with another. |
| Ref | Expression |
|---|---|
| cdacomen.1 | ⊢ A ∈ V |
| cdacomen.2 | ⊢ B ∈ V |
| Ref | Expression |
|---|---|
| cdadom3 | ⊢ A ≼ (A +c B) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cdacomen.1 | . . 3 ⊢ A ∈ V | |
| 2 | ssun1 1621 | . . 3 ⊢ A ⊆ (A ∪ B) | |
| 3 | ssdomg 3311 | . . 3 ⊢ (A ∈ V → (A ⊆ (A ∪ B) → A ≼ (A ∪ B))) | |
| 4 | 1, 2, 3 | mp2 43 | . 2 ⊢ A ≼ (A ∪ B) |
| 5 | cdacomen.2 | . . 3 ⊢ B ∈ V | |
| 6 | 1, 5 | uncdadom 3718 | . 2 ⊢ (A ∪ B) ≼ (A +c B) |
| 7 | domtr 3320 | . 2 ⊢ ((A ≼ (A ∪ B) ∧ (A ∪ B) ≼ (A +c B)) → A ≼ (A +c B)) | |
| 8 | 4, 6, 7 | mp2an 520 | 1 ⊢ A ≼ (A +c B) |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 1092 Vcvv 1348 ∪ cun 1485 ⊆ wss 1487 class class class wbr 2054 (class class class)co 3001 ≼ cdom 3272 +c ccda 3714 |
| This theorem is referenced by: cdainf 3731 infunabs 4946 infcdaabs 4947 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-un 1076 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3or 582 df-3an 583 df-ex 679 df-sb 853 df-eu 1009 df-mo 1010 df-clab 1093 df-cleq 1097 df-clel 1099 df-ral 1205 df-rex 1206 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-tp 1814 df-op 1815 df-uni 1920 df-int 1966 df-tr 2042 df-br 2063 df-opab 2098 df-eprel 2122 df-id 2125 df-po 2128 df-so 2138 df-fr 2169 df-we 2186 df-ord 2202 df-on 2203 df-suc 2205 df-xp 2424 df-rel 2425 df-cnv 2426 df-co 2427 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fun 2432 df-fn 2433 df-f 2434 df-f1 2435 df-fo 2436 df-f1o 2437 df-fv 2438 df-opr 3003 df-oprab 3004 df-1o 3104 df-er 3200 df-en 3274 df-dom 3275 df-cda 3715 |