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| Mirrors > Home > MPE Home > Th. List > elelsuc | Structured version Visualization version GIF version | ||
| Description: Membership in a successor. (Contributed by NM, 20-Jun-1998.) |
| Ref | Expression |
|---|---|
| elelsuc | ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ suc 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | orc 881 | . 2 ⊢ (𝐴 ∈ 𝐵 → (𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵)) | |
| 2 | elsucg 6459 | . 2 ⊢ (𝐴 ∈ 𝐵 → (𝐴 ∈ suc 𝐵 ↔ (𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵))) | |
| 3 | 1, 2 | mpbird 260 | 1 ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ suc 𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∨ wo 861 = wceq 1570 ∈ wcel 2147 suc csuc 6390 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-tru 1573 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-v 3456 df-un 4154 df-sn 4589 df-suc 6394 |
| This theorem is used by: suctr 6477 pssnn 9222 ttrcltr 9754 ttrclss 9758 ttrclselem2 9764 pwsdompw 10320 fin1a2lem4 10520 grur1a 10943 bnj570 35646 fineqvnttrclselem3 35932 satom 36329 satfv0 36331 satfvsuc 36334 satf00 36347 satf0suc 36349 sat1el2xp 36352 fmla 36354 fmla0 36355 fmlasuc0 36357 satfdmfmla 36373 nmulprop 37154 finxpsuclem 38588 parswapprop 51108 |
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