Functions and exponents

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I am a computer science student. I do not know much about the functions in maths. What does it mean to have a plus sign as exponent. plese see equation number 23

I unable to understand it.

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I suspect the + sign means the expression can't be negative. If it's negative the + sign makes the expresssion 0.

My answer is based on this:

What does it mean to have a lone plus sign in the exponent/superscript (Modified Weiszfeld algorithm)