Rows and columns

Tuesday September 15, 2026

Rows go left and right, like seating in a theater.

Rows are horizontal and easy to read like lines of text.

Columns go up and down, like stone pillars holding up a building.

Columns are vertical and have things one on top of the other.

Here are three rows. How many columns?

\[ \begin{bmatrix} r & o & w \cr r & o & w \cr r & o & w \cr \end{bmatrix} \]

Here are three columns. How many rows?

\[ \begin{bmatrix} c & c & c \cr o & o & o \cr l & l & l \cr u & u & u \cr m & m & m \cr n & n & n \cr \end{bmatrix} \]