# What does [x] means in mathematics ?

by momentum
Tags: mathematics, means
 Sci Advisor PF Gold P: 1,379 So, in what way is the defintion for $$[ x ]$$ you've given different from $$\lfloor x \rfloor$$ ? - also given to be the symbol for the floor function, which matches the definition you gave. None, AFAIK, just a "who's the author" thing. IMO, it's just a bad nomen confusum problem. I've also seen it used in characteristic functions. Somebody ought to pick one use, and pitch the rest.... :) and penalize deviating authors 10 points for misuse. :)