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Mirrors > Home > MPE Home > Th. List > Mathboxes > bnj216 | Structured version Visualization version GIF version |
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.) |
Ref | Expression |
---|---|
bnj216.1 | ⊢ 𝐵 ∈ V |
Ref | Expression |
---|---|
bnj216 | ⊢ (𝐴 = suc 𝐵 → 𝐵 ∈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bnj216.1 | . . 3 ⊢ 𝐵 ∈ V | |
2 | 1 | sucid 6264 | . 2 ⊢ 𝐵 ∈ suc 𝐵 |
3 | eleq2 2901 | . 2 ⊢ (𝐴 = suc 𝐵 → (𝐵 ∈ 𝐴 ↔ 𝐵 ∈ suc 𝐵)) | |
4 | 2, 3 | mpbiri 260 | 1 ⊢ (𝐴 = suc 𝐵 → 𝐵 ∈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1533 ∈ wcel 2110 Vcvv 3494 suc csuc 6187 |
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 2157 ax-12 2173 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-v 3496 df-un 3940 df-sn 4561 df-suc 6191 |
This theorem is referenced by: bnj219 31998 bnj1098 32050 bnj556 32167 bnj557 32168 bnj594 32179 bnj944 32205 bnj966 32211 bnj969 32213 bnj1145 32260 |
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