The definition of a double complex on Weibel's an Introduction to Homological Algebra is
...... the maps $d^h$ go horizontall, the maps $d^v$ go vertically, and eah square anticommutes.
While that on nLab is
......each row and each column is a complex and such that all the squares commute.
I am a bit comfused. Which one is the standard version or are they both fine?
