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.
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.
Tests whether this Expression has a subexpression at the given position.