 1 − 2 + 3 − 4 + ⋯

In mathematics, 1 − 2 + 3 − 4 + ··· is an infinite series whose terms are the successive positive integers, given alternating signs.Using sigma summation notation the sum of the first "m" terms of the series can be expressed as

The infinite series diverges, meaning that its sequence of partial sums, , does not tend towards any finite limit.