Alpha-equality.
Alpha-equality.
Lambda expression to compare against.
whether this lambda expression is equal to that lambda expression modulo alpha-conversion.
Retrieves this expression's subexpression at a given position.
Retrieves this expression's subexpression at a given position.
The position to be retrieved.
The subexpression at pos.
Finds all HOL positions of a subexpression in this expression.
Finds all HOL positions of a subexpression in this expression.
The subexpression to be found.
A list containing all positions where exp occurs.
Retrieves this expression's subexpression at a given position, if there is one.
Retrieves this expression's subexpression at a given position, if there is one.
The position to be retrieved.
If there is a subexpression at that position, return Some(that expression). Otherwise None.
Returns the subexpression at the given position, if it exists.
Tests whether this expression has a subexpression at a given position.
Tests whether this expression has a subexpression at a given position.
The position to be tested.
Whether this(pos) is defined.
Tests whether this Expression has a subexpression at the given position.