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| − | '''Geometry''' is the branch of mathematics that deals with properties of [[shape]]s and spatial relationships. It is one of the five most basic branches of [[pure mathematics]], the others being [[algebra]], [[number theory]], [[analysis]], and [[logic]]. Primarily, the subject may be divided into six branches: | + | '''Geometry''' is the branch of mathematics that deals with properties of [[shape]]s and spatial relationships. In its modern form, it is the pure mathematics of [[point]]s and [[line]]s and [[curve]]s and [[surface]]s. It is one of the two most basic branches of [[mathematics]], the other being [[algebra]], the study of relationships between [[number]]s. Primarily, the subject may be divided into six branches: |
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| | * [[Euclidean geometry]] studies geometry where the [[parallel postulate]] is valid. | | * [[Euclidean geometry]] studies geometry where the [[parallel postulate]] is valid. |
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| | * [[Topology]], broadly speaking, studies properties of shapes invariant under [[continuous function]]s. | | * [[Topology]], broadly speaking, studies properties of shapes invariant under [[continuous function]]s. |
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| − | * [[Geometric measure theory]] studies objects that possess a notion of fractional dimension, such as fractals. | + | * [[Riemannian geometry]], a geometry developed by [[Riemann]]. |
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| | + | There are a few main types of spatial forms: |
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| | + | * [[Point]]s, an infinitely small dot. |
| | + | * [[Line]]s, an infinitely long set of points expanding in two opposite directions. |
| | + | * [[Plane]]s, an infinitely wide set of lines, stretching out in four directions. |
| | + | * [[Space]], all of the 3-dimensional space that points, lines, and planes exist ons. |
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| | [[category:geometry]] | | [[category:geometry]] |