Main diagonal
In linear algebra, the main diagonal (sometimes principal diagonal, primary diagonal, leading diagonal, or major diagonal) of a matrix is the collection of entries where . All off-diagonal elements are zero in a diagonal matrix. The following three matrices have their main diagonals indicated by red 1's:
Antidiagonal
The antidiagonal (sometimes counter diagonal, secondary diagonal, trailing diagonal, minor diagonal, or bad diagonal) of a dimension square matrix, , is the collection of entries such that for all . That is, it runs from the top right corner to the bottom left corner:
gollark: The obvious alternative is wireless charging which follows you around.
gollark: coralßßssßsßßßssmartwatch™?
gollark: Oh.
gollark: You should just plug it into the wall or something so you can integrate it into your wireless network and monitoring system.
gollark: None of that puny induction charging stuff, just undirected microwave beams and a rectenna.
See also
- Trace
References
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