36 (number) 36 (number) 36 (thirty-six) is the natural number following 35 and preceding 37. 36 is both the square of six and a triangular number, making it a square triangular number. It is the smallest square triangular number other than one, and it is also the only triangular number other than one whose square root is also a triangular number. It is also a circular number- a square number that ends with the same integer by itself (6×6=36). It is the smallest number "n" with exactly eight solutions to the equation φ("x") = "n". Being the smallest number with exactly nine
Square root of a 2 by 2 matrix denominator "t" be zero. The formula above fails completely if "δ" and "τ" are both zero; that is, if "D" = −"A" and "A" = −"BC", so that both the trace and the determinant of the matrix are zero. In this case, if "M" is the null matrix (with "A" = "B" = "C" = "D" = 0), then the null matrix is also a square root of "M", as are for any real or complex values of "b" and "c". Otherwise "M" has no square root. If "M" is diagonal (that is, "B" = "C" = 0), one can