is addition before subtraction in order of operations
Order of operations These mnemonics may be misleading when written this way,[6] especially if the user is not aware that multiplication and division are of equal precedence, as are addition and subtraction. Using any of the above rules in the order "addition first, subtraction afterward" would incorrectly evaluate the expression[6]
Arithmetic progression The behavior of the arithmetic progression depends on the common difference d. If the common difference is:
1 + 2 + 3 + 4 + ⋯ which increases without bound as n goes to infinity. Because the sequence of partial sums fails to converge to a finite limit, the series does not have a sum.
Exponentiation Any nonzero number raised to the 0 power is 1:[11]
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
Arithmetic progression This sum can be found quickly by taking the number n of terms being added (here 5), multiplying by the sum of the first and last number in the progression (here 2 + 14 = 16), and dividing by 2: