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Related theorems GIF version |
| Description: Membership in an image. Theorem 34 of [Suppes] p. 65. |
| Ref | Expression |
|---|---|
| elima.1 | ⊢ A ∈ V |
| Ref | Expression |
|---|---|
| elima3 | ⊢ (A ∈ (B “ C) ↔ ∃x(x ∈ C ⋀ 〈x, A〉 ∈ B)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elima.1 | . . 3 ⊢ A ∈ V | |
| 2 | 1 | elima2 3415 | . 2 ⊢ (A ∈ (B “ C) ↔ ∃x(x ∈ C ⋀ xBA)) |
| 3 | df-br 2625 | . . . 4 ⊢ (xBA ↔ 〈x, A〉 ∈ B) | |
| 4 | 3 | anbi2i 482 | . . 3 ⊢ ((x ∈ C ⋀ xBA) ↔ (x ∈ C ⋀ 〈x, A〉 ∈ B)) |
| 5 | 4 | exbii 1053 | . 2 ⊢ (∃x(x ∈ C ⋀ xBA) ↔ ∃x(x ∈ C ⋀ 〈x, A〉 ∈ B)) |
| 6 | 2, 5 | bitr 173 | 1 ⊢ (A ∈ (B “ C) ↔ ∃x(x ∈ C ⋀ 〈x, A〉 ∈ B)) |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 146 ⋀ wa 223 ∈ wcel 960 ∃wex 982 Vcvv 1814 〈cop 2415 class class class wbr 2624 “ cima 3179 |
| This theorem is referenced by: hbima 3417 elimasn 3432 imaiun 3870 tz9.12lem1 4669 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2708 ax-pow 2748 ax-pr 2785 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-rex 1653 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-op 2420 df-br 2625 df-opab 2672 df-xp 3190 df-cnv 3192 df-dm 3194 df-rn 3195 df-res 3196 df-ima 3197 |