Hi, I need help with this definition. It seems pretty vague to me:(adsbygoogle = window.adsbygoogle || []).push({});

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....

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# Need help with this definition

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