mathematical notation

• How to Write Multiple Sums with Complicated Indices
  When nested sum limits become hard to read, define the admissible index set and write one sum over it; keep nesting when order matters.
• How to Typeset Expected Value in LaTeX Math Mode
  Use \mathbb{E}[X] in LaTeX math mode for expected value; learn the needed package, inline and display syntax, conditional notation, and common fixes.
• What Are Esoteric Integral Symbols Used For?
  Learn what closed, multiple, surface, and average-integral symbols mean, when to use them, and how to typeset extended integral notation in LaTeX.
• What Does the Equals Sign Mean in Math?
  In standard mathematics, = is the equality sign: it states that two expressions have the same value. It is a relation, not an arithmetic operation.