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Need help with this definition

  1. Apr 30, 2010 #1
    Hi, I need help with this definition. It seems pretty vague to me:

    A function f is increasingat a if there is some number delta > 0 such that

    f( x ) > f ( a ) if a < x < a + (delta)

    and

    f( x ) < f( a ) if a - (delta) < x < a


    My problem is that 'x' was never quantified... is this for ANY x that satisfies a < x < a + (delta), or some x that satisfies a < x < a + (delta) ?

    thanks....
     
  2. jcsd
  3. Apr 30, 2010 #2
  4. Apr 30, 2010 #3
    thanks, I've got it
     
    Last edited: May 1, 2010
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