Metamath Proof Explorer


Theorem sbtru

Description: The result of substituting in the truth constant "true" is true. (Contributed by BJ, 2-Sep-2023)

Ref Expression
Assertion sbtru [ 𝑦 / 𝑥 ] ⊤

Proof

Step Hyp Ref Expression
1 tru
2 1 sbt [ 𝑦 / 𝑥 ] ⊤