I was wondering why the \in symbol becomes a \subset symbol, once it is inserted in the subscript of a \sum.
It could be a feature activated by some
\latex
package or even a bug\latex
package or even a bugLearn LaTeX easily with newest books:
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Learn LaTeX easily with newest books:
The LaTeX Beginner's Guide: 2nd edition and perfect for students writing a thesis
The LaTeX Cookbook: 2nd edition full of practical examples for mathematics, physics, chemistry, and more
LaTeX Graphics with TikZ: the first book about TikZ for perfect drawings in your LaTeX thesis