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Thanks Ijon! Perfect, that should do it!

If you are using enumitem you can also change the leftmargin, the labelwidth and/or the labelsep.

BTW: It seems this should be a enumerated list. If this is true, I would recommend enumerate with automatic numeration instead if itemize .

If this answer is not enough so solve your problem, please ...

I wish to adjust the amount of horizontal spacing between the item label and the item text in the itemize environment, and further, keep the item label left aligned. Here's an example code:

\begin{itemize}[align=left]
\item[\textrm{[1]}] Let z1 and z2 be complex numbers, where z2 is not equal to ...