LFD Book Forum - Slide 4 in Lecture 6

Someone asked on another forum for clarification of the matrix in Slide 4 of Lecture 6 that lists the table of

groupings of the matrix rows, and the TA gave a nice answer by constructing these groupings for the puzzle that was given at the end of Lecture 5:

Quote:

Originally Posted by Victor Kasatkin

In the puzzle, the table is

1. $\ ---$
2. $\ --+$
3. $\ -+-$
4. $\ +--$

By definition of

, it should consist of those rows which will still remain unique after removing the last column. These are rows 3 and 4. Rows 1 and 2 will coincide after removing the last column, so they go to

: row 1 goes to

and row 2 goes to