Possible Duplicate:
Remove tick labels, but retain tick marks in RegionPlot (and related functions)
I need to display a 2D graph, say $y=x^2$ with tick-marks along the $x$ and $y$-axes but with no numbers (e.g. 1, 2, 3 ...) indicating these tick-mark values.
What is the most efficient way to perform this task? Thanks!