2020 Top Ten of Polemic for Mathematics

Nice name

In set theory, a nice name is used in forcing to impose an upper bound on the number of subsets in the generic model. It is used in the context of forcing to prove independence results in set theory such as Easton's theorem

Like terms

In algebra, like terms are terms that have the same variables and powers. The coefficients do not need to match

Perpendicular

In elementary geometry, two geometric objects are perpendicular if they intersect at a right angle

Circumference

In geometry, the circumference is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle, as if it were opened up and straightened out to a line segment. More generally, the perimeter is the curve length around any closed figure. Circumference may also refer to the circle itself, that is, the locus corresponding to the edge of a disk. The circumference of a sphere is the circumference, or length, of any one of its great circles

Tree diagram (probability theory)

In probability theory, a tree diagram may be used to represent a probability space

Clock angle problem

Clock angle problems are a type of mathematical problem which involve finding the angle between the hands of an analog clock

4000 (number)

4000 is the natural number following 3999 and preceding 4001. It is a decagonal number

Composite number

A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Equivalently, it is a positive integer that has at least one divisor other than 1 and itself. Every positive integer is composite, prime, or the unit 1, so the composite numbers are exactly the numbers that are not prime and not a unit

Table of prime factors

The tables contain the prime factorization of the natural numbers from 1 to 1000

Linear equation

In mathematics, a linear equation is an equation that may be put in the form where are the variables, and are the coefficients, which are often real numbers. The coefficients may be considered as parameters of the equation, and may be arbitrary expressions, provided they do not contain any of the variables. To yield a meaningful equation, the coefficients are required to not all be zero