Base (Neighborhood System)

A base for a neighborhood system of a point is a collection of Open Sets such that belongsto every member of , and any Open Set containing also contains a member of as a Subset.

• Diamond
• Dice
• Dichroic Polynomial
• Dido's Problem
• Diesis
• Diffeomorphism
• Difference
• Difference Equation
• Trigonometry Values Pi/4
• Trigonometry Values Pi/5
• Trigonometry Values Pi/6
• Trigonometry Values Pi/7
• Trigonometry Values Pi/8
• Trigonometry Values Pi/9
• Trigyrate Rhombicosidodecahedron
• Trihedron
• Trilinear Coordinates
• Trilinear Line
• Trilinear Polar
• Trillion
• Trimagic Square
• Trimean
• Trimorphic Number
• Trinoid
• Trinomial