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  • $\begingroup$ for being clear y[x_]= : it is like one time function y[x_]:= it is like normal funtion ?? $\endgroup$ Commented Jul 29, 2012 at 13:17
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    $\begingroup$ +1 but please include the names Set and SetDelayed in your answer, for reference and easy searching. $\endgroup$ Commented Jul 29, 2012 at 13:19
  • $\begingroup$ Is there a difference then between y[x_]= and y[x_]:=y[x]= for caching values ? $\endgroup$ Commented Jul 29, 2012 at 13:53
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    $\begingroup$ @DSaad, no, take what acl said more literally. y[x_]=rhs means "evaluate the rhs to get the expression of the FUNCTION", while y[x_]:=rhs means that rhs is literally the expression of the function $\endgroup$ Commented Jul 29, 2012 at 14:37
  • $\begingroup$ @FaysalAberkane definately. y[x_]= doesn't cache any values at all $\endgroup$ Commented Jul 29, 2012 at 14:39