query: instance_of space 
supports: Quantity is a property that can exist as a magnitude or multitude. Quantities can be compared in terms of "more", "less", or "equal", or by assigning a numerical value in terms of a unit of measurement. Quantity is among the basic classes of things along with quality, substance, change, and relation. Some quantities are such by their inner nature (as number), while others are functioning as states (properties, dimensions, attributes) of things such as heavy and light, long and short, broad and narrow, small and great, or much and little. A small quantity is sometimes referred to as a quantulum. A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols). Definitions can be classified into two large categories, intensional definitions (which try to give the essence of a term) and extensional definitions (which proceed by listing the objects that a term describes). Another important category of definitions is the class of ostensive definitions, which convey the meaning of a term by pointing out examples. A term may have many different senses and multiple meanings, and thus require multiple definitions. Space is the boundless three-dimensional extent in which objects and events have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. The concept of space is considered to be of fundamental importance to an understanding of the physical universe. However, disagreement continues between philosophers over whether it is itself an entity, a relationship between entities, or part of a conceptual framework. Mathematics (from Greek  "máthma", knowledge, study, learning) is the study of topics such as quantity (numbers), structure, space, and change. There is a range of views among mathematicians and philosophers as to the exact scope and definition of mathematics. In mathematics , a space is a set ( sometimes called a universe ) with some added structure . Mathematical spaces often form a hierarchy , i.e. , one space may inherit all the characteristics of a parent space . For instance , all inner product spaces are also normed vector spaces , because the inner product induces a norm on the inner product space such that : \ left \ x \ right \ = \ sqrt ( \ langle x , x \ rangle ) , where the norm is indicated by enclosing in double vertical lines , and the inner product is indicated enclosing in by angle brackets . Modern mathematics treats `` space '' quite differently compared to classical mathematics .
candidates: change definition direction four mathematics may measurement number part phrase position property quantity set space structure study term three understanding unit of measurement value
answer: term