I found something, but I'm not sure what it is. Summation Notation
math operators - LaTeX adjusting \sum limits - TeX - LaTeX Stack Exchange
How to use sigma, summation(Σ) symbol in LaTeX?
7.2 "Sigma notation" for sums - YouTube
How to insert Limits, Summation and Integral Equations in LaTeX | Share Latex | Learn LaTeX 09 - YouTube
Positioning limits above and below a summation in LaTeX/Overleaf - YouTube
math mode - making a big summation sign - TeX - LaTeX Stack Exchange
How to use the summation symbol
math mode - Different Sum signs - TeX - LaTeX Stack Exchange
1,080 Summation Symbol Images, Stock Photos, 3D objects, & Vectors | Shutterstock
How do you use summation(∑) in LaTeX? | Sigma symbol
How to Create and use summation symbol in LaTeX
How do you use summation(∑) in LaTeX? | Sigma symbol
What is the latex code for writing a condition under the subscript of a sum? - TeX - LaTeX Stack Exchange
How do you use summation(∑) in LaTeX? | Sigma symbol
How do you use summation(∑) in LaTeX? | Sigma symbol
File:Latex math example substack sum.png - Wikimedia Commons
6. Large operators | LaTeX manual
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Iverson bracket - Wikipedia
math mode - making a big summation sign - TeX - LaTeX Stack Exchange
Sum in Math equation editor - Microsoft Community
math mode - making a big summation sign - TeX - LaTeX Stack Exchange
How to write Sigma(∑,σ) symbol in LaTeX?
