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Mirrors > Home > LLPE Home > Th. List > dfsub1 | Structured version |
Description: Restatement of dfsub 233 with nilad equality. |
Ref | Expression |
---|---|
dfsub1 | ⊦ ([x ≔ Y] 𝜑 ⧟ ∇x(x = Y ⊸ 𝜑)) |
Step | Hyp | Ref | Expression |
---|
Colors of variables: wff var nilad |
Syntax hints: ⧟ wlb 55 ⊸ wli 61 nvar 203 [wsub 207 ∇wnnu 242 = weq 246 |
WARNING: This theorem has an
incomplete proof. |
This theorem is referenced by: (None) |
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