What Does the Limit of Summation i<j Mean?

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The limit of a summation expressed as i<j indicates that the index i runs from its starting value up to, but not including, j. This means i can take values from 0 to j-1, ensuring that i is always strictly less than j. The discussion clarifies that the upper limit for i is determined by the value of j, which is not included in the summation. Understanding this notation is crucial for correctly interpreting summations in mathematical contexts. The concept emphasizes the importance of defining index limits in summation notation.
AKBAR
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Hi,

I'm having some trouble understanding what is meant when the limit of a summation is i<j. Does it mean the limits are i = 0 to i = j?

Thanks!
 
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If i is always strictly less than j, then index i's maximal value is j-1.
 
Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?

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