Separation

Two distinct point pairs and separate each other if , , , and lie on a Circle (or line) insuch order that either of the arcs (or the line segment ) contains one but not both of and . In addition, thepoint pairs separate each other if every Circle through and intersects (or coincides with) every Circle through and . If the point pairs separate each other, then the symbol is used.

• Unique Factorization Theorem
• Unit
• Unital
• Unitary Aliquot Sequence
• Unitary Amicable Pair
• Unitary Divisor
• Unitary Group
• Unitary Matrix
• Unitary Multiperfect Number
• Unitary Multiplicative Character
• Unitary Perfect Number
• Unitary Sociable Numbers
• Unitary Transformation
• Unitary Unimodular Group
• Unit Circle
• Unit Disk
• Unit Fraction
• Unit Matrix
• Unit Point
• Unit Ring
• Unit Sphere
• Unit Square
• Unit Step
• Unit Vector
• Unity