Seen here https://stat.ethz.ch/education/semesters/ss2012/ams/slides/v4.1.pdf (14th slide), the formula to compute bij, we have, for instance, the elements di. (notice the dot in place of j) and d.. with two dots in place of ij. What do those dots mean?
2026-03-25 09:23:28.1774430608
What does a dot mean in matrix element index?
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