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Related theorems GIF version |
| Description: The result of an operation is a set. |
| Ref | Expression |
|---|---|
| oprex | ⊢ (AFB) ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-opr 3956 | . 2 ⊢ (AFB) = (F ‘〈A, B〉) | |
| 2 | fvex 3723 | . 2 ⊢ (F ‘〈A, B〉) ∈ V | |
| 3 | 1, 2 | eqeltr 1541 | 1 ⊢ (AFB) ∈ V |