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Square number 16 as sum of gnomons.. In mathematics, a square number or perfect square is an integer that is the square of an integer; [1] in other words, it is the product of some integer with itself.
Figure 1. Plots of quadratic function y = ax 2 + bx + c, varying each coefficient separately while the other coefficients are fixed (at values a = 1, b = 0, c = 0). A quadratic equation whose coefficients are real numbers can have either zero, one, or two distinct real-valued solutions, also called roots.
Incomplete ultimate tic-tac-toe game (the large 'X's and 'O's represent small boards that are won by that player). The previous move was O playing in the center square of the bottom-right board, forcing X to play their next move in smaller board located in the center of the larger board (highlighted in blue).
In mathematics, particularly abstract algebra, an algebraic closure of a field K is an algebraic extension of K that is algebraically closed.It is one of many closures in mathematics.