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.
An algebraic structure studied therein.
A branch of mathematics dealing with equational classes of algebras, where similar theorems from disparate branches of algebra are unified.