Integer that remains unchanged when its digits are written in reverse order.
A method for finding the volume of a solid of revolution. The volume equals the product of the area of the region being rotated times the distance traveled by the centroid of the region in one rotation.
For a given point, called the focus, and a given line not through the focus, called the directrix, it is the locus of points such that the distance to the focus equals the distance to the directrix.
The assumption that, given a point P and a line m not through P, there is exactly one line passing through P that is parallel to m.
A polyhedron with six faces, all of which are parallelograms.
A system of equations with more than one dependent variable; are often used to represent the position of a moving point.
A derivative of a function that has more than one independent variable
A differential equation that contains at least one partial derivative.
The process of writing any proper rational expression as a sum of proper rational expressions.
A finite sequence of the form a = x0 < x1 < x2 < ... < xn = b.
Rewriting a positive integer as the sum of smaller positive integers; the sum of any two adjacent elements in a row can be found between them on the next row; each row begins and ends with 1.
A number n for which the sum of all the positive integer factors of n which are less than n add up to n.
A function f for which there exists a number p such that f(x + p) = f(x) for all x.
The Greek letter representing the Golden Ratio.
The ratio of the Circumference to the diameter of a circle.
1st letter/# words
Another name for the Sandwich Theorem or the Squeeze Theorem.
The solids which have faces that are all congruent regular polygons and which has dihedral angles that are all congruent.
The positive x-axis.
A statement accepted as true without proof.
The level of detail in a number or estimate.
A formula for the derivative of the product of two functions.
A stretched sphere shaped like a watermelon; formally, a surface of revolution obtained by revolving an ellipse about its major axis.
A subset which is not the same as the original set itself.
Suppose that a ∝ b. This means that a/b is constant, or that a = kb where k is a constant.
A shorthand name for a series with the variable taken to a negative exponent.
A set of three positive integers which satisfies the Pythagorean theorem a2 + b2 = c2.
That which was to be proven.
A polynomial of degree 4.
A polynomial of degree 5.
The 20th and 80th percentiles of a set of data.
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