notation > "'if' term 46 e 'then' term 46 t 'else' term 46 f" non associative with precedence 46
for @{ match $e in bool with [ true ⇒ $t | false ⇒ $f] }.
notation < "hvbox('if' \nbsp term 46 e \nbsp break 'then' \nbsp term 46 t \nbsp break 'else' \nbsp term 49 f \nbsp)" non associative with precedence 46
- for @{ match $e with [ true ⇒ $t | false ⇒ $f] }.
+ for @{ match $e return $T with [ true ⇒ $t | false ⇒ $f] }.
theorem bool_to_decidable_eq:
∀b1,b2:bool. decidable (b1=b2).