The branch of mathematics dealing with spatial relationships.
A mathematical system that deals with spatial relationships and that is built on a particular set of axioms; a subbranch of geometry which deals with such a system or systems.
A mathematical object comprising representations of a space and of its spatial relationships.
The observed or specified spatial attributes of an object, etc.
A calculation involving subtracting.
The process of subtracting a number from another.
The removal of something.