CS223 · Annotated SlidesChapter 3 — Introduction to Determinants
Chapter 3 · Annotated slides

Introduction to Determinants

The 2×2 and 3×3 determinant, minors and cofactors, cofactor expansion along any row or column, and the determinant of a triangular matrix.

Slide text Study notes Highlight: key words Tips, tricks & traps Seen again elsewhere How it can come up
Slide 1: CS 223: Computational Linear Algebra
Exam weight Low
    Slide 2: Determinants
    Exam weight Low

      3
      Exam weight Low
        Slide 5: Slide 5
        Exam weight Low

          6
          Exam weight Low
            Slide 7: Example
            Exam weight Low
              Slide 8: Determinant of a Triangular Matrix
              Exam weight High
              1. Triangular matrix: det = product of the diagonal entries.
              🎯 How this can come up · 1 question
              MCQ

              det of [[2, 5, 1], [0, 3, 7], [0, 0, −1]] is:

              Slide 9: Slide 9
              Exam weight Low
                Slide 10: Slide 10
                Exam weight Low

                  11
                  Exam weight Low
                    Slide 12: Practice problem 1
                    Exam weight Low
                      Slide 13: Practice problem 2
                      Exam weight Low

                        Practice problem 3

                        Let A a matrix 2x2. Write 5A. Is det 5A = 5 det A?

                        14
                        Exam weight Low

                          Practice problem 4

                          Find the determinant by row reduction to echelon form.

                          Practice problem 4
                          15
                          Exam weight Low