TITLE: Should I write $i$ before or after the imaginary part?
QUESTION [10 upvotes]: Should I write complex numbers as $a+ib$ or $a+bi$? Maybe there are certain cases where I should write it one way and other cases where I should write it the other way. What do you think?

REPLY [9 votes]: It's really a matter of style, but I typically see integer factors written first, then other real constants, then $i$, then variables.  Thus you might have $2\pi inx$.