ALPHA_CONV : term -> conv
STRUCTURE
Drule
SYNOPSIS
Renames the bound variable of a lambda-abstraction.
DESCRIPTION
If x is a variable of type ty and M is an abstraction (with bound variable y of type ty and body t), then ALPHA_CONV x M returns the theorem: 
   |- (\y.t) = (\x'. t[x'/y])
where the variable x':ty is a primed variant of x chosen so as not to be free in \y.t.
FAILURE
ALPHA_CONV x tm fails if x is not a variable, if tm is not an abstraction, or if x is a variable v and tm is a lambda abstraction \y.t but the types of v and y differ.
SEEALSO
ALPHA, GEN_ALPHA_CONV
HOL  Kananaskis-14