Lenses
A concept lens reads a definition or theorem from one angle. Choose a lens to read the lens sections written that way across the notes, or choose an object to see its readings side by side.
2 lens sections are indexed so far.
Course
Objects read through a lens
Read by lens
Structural: What rules determine an object, and what information it preserves.
- MATH1030 7.1One scalar has two useful readingsA reading of Recursive definition of the determinant · 1 reading
The recursive expansion is an algorithmic way to calculate a number: choose an entry, delete its row and column, and continue on the smaller determinant. The same number also has a structural role: zero rows, repeated rows, and triangular shape force predictable values. These structural rules follow from the expansion. A cofactor is a signed scalar, not a new row or column of the matrix.