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Mirrors > Home > MPE Home > Th. List > ifex | Structured version Visualization version GIF version |
Description: Existence of the conditional operator (inference form). (Contributed by NM, 2-Sep-2004.) |
Ref | Expression |
---|---|
ifex.1 | ⊢ 𝐴 ∈ V |
ifex.2 | ⊢ 𝐵 ∈ V |
Ref | Expression |
---|---|
ifex | ⊢ if(𝜑, 𝐴, 𝐵) ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ifex.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | ifex.2 | . 2 ⊢ 𝐵 ∈ V | |
3 | 1, 2 | ifcli 4511 | 1 ⊢ if(𝜑, 𝐴, 𝐵) ∈ V |
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