What is the maximum of x and y?

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What is the "maximum"

I don't understand what this is supposed to mean when used with a set of numbers like:

maximum of {x,y}

Can anybody help?
 
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Plot these numbers as a smooth line:

-1,-1
0,0
1,-1

What is the local maximum around x=0?
 
Is {x,y} a set of coordinates on the curve? Or are they the actual point of the relative maximum.
 
Well if you mean extremas, then you {x,y} must be a stationary point where the gradient of the tangent is equal to 0.

If so, then it is talking about the nature of the curve. An example is:
consider the graphs of the following...
y=x^2, at x=0, it is a minimum stationary point.
y=-x^2, at x=0, it is a maximum stationary point.
 
ghostchaox said:
I don't understand what this is supposed to mean when used with a set of numbers like:

maximum of {x,y}

Can anybody help?

Based on what you wrote,

maximum of {x,y} =
x, if x>=y
y, otherwise