[[TableOfContents]]

= 1일차 =
 * linear equation
 * consist and uniqueness
 * coefficient and argument matrix
 * echelon form
 * reduced row echelon form
 * pivot position
 * row reduction algorithm - gauss-Jordan decomposition
 * basic and free variable
 * vector
 * vector equation
 * vector in R^n
 * linear combination
 * span