rectangular number
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number game — Introduction any of various puzzles and games that involve aspects of mathematics. Mathematical recreations comprise puzzles and games that vary from naive amusements to sophisticated problems, some of which have never been solved.… … Universalium
number plate — noun Either of a pair of rectangular metal plates, containing a mixture of letters and numbers fixed to the front and rear of a motor car showing that its identity has been registered with the DVLA Syn: license plate … Wiktionary
Pronic number — A pronic number, oblong number, rectangular number or heteromecic number, is a number which is the product of two consecutive integers, that is, n (n + 1). The n th pronic number is twice the n th triangular number and n more than… … Wikipedia
Hexagonal number — A hexagonal number is a figurate number, The n th hexagonal number will be the number of points in a hexagon with n regularly spaced points on a side, as shown in [http://mathworld.wolfram.com/HexagonalNumber.html] . The formula for the n th… … Wikipedia
oblong number — noun rectangular number … Wiktionary
Complex number — A complex number can be visually represented as a pair of numbers forming a vector on a diagram called an Argand diagram, representing the complex plane. Re is the real axis, Im is the imaginary axis, and i is the square root of –1. A complex… … Wikipedia
Winding number — The term winding number may also refer to the rotation number of an iterated map. This curve has winding number two around the point p. In mathematics, the winding number of a closed curve in the plane around a given point is an integer… … Wikipedia
Imaginary number — In mathematics, an imaginary number (or purely imaginary number) is a complex number whose squared value is a real number not greater than zero.Ahlfors, Lars V. Complex Analysis. 3rd Ed. New York: McGraw Hill, 1979. Pages 1 4.] The imaginary unit … Wikipedia
Hypercomplex number — The term hypercomplex number has been used in mathematics for the elements of algebras that extend or go beyond complex number arithmetic.Hypercomplex numbers have had a long lineage of devotees including Hermann Hankel, Georg Frobenius, Eduard… … Wikipedia
Froude number — The Froude number is a dimensionless number comparing inertial and gravitational forces. It may be used to quantify the resistance of an object moving through water, and compare objects of different sizes. Named after William Froude, the Froude… … Wikipedia
