determinant
\[ \left |\begin{array}{cccc} 1 &6 & 9 \7 &90 & f(x) \9 & \psi(x) &g(x) \\end{array}\right| \]
$$\left |\ begin{array}{cccc}1 &6 & 9 \7 &90 & f(x) \9 & \psi(x) &g(x) \\end{array}\right|$$
Matrix
If we replace | with () or [], we get a matrix.
right-aligned
\[ \left (\begin{array}{rrrr} 1 &6 & 9 \7 &90 & f(x) \9 & \psi(x) &g(x) \\end{array}\right) \]
Left aligned
\[ \left [\begin{array}{llll} 1 &6 & 9 \7 &90 & f(x) \9 & \psi(x ) &g(x) \\end{array}\right] \]
& is the alignment symbol.
l=left
c=center
r=right
Reference:
- Latex outputs determinants, matrices, and equations
- Greek alphabet written in Markdown