Direction fields

To plot Slope Fields

ode1 := diff(y(t), t) = 4*y(t) - t; 
with(DEtools);
IC1 := [[0, i] $ (i = -5 .. 5), [y(i) = 0] $ (i = -5 .. 5)];
DEplot(ode1, [y(t)], t = -5 .. 5, y = -5 .. 5, IC1, arrows = LINE, title = "Figure 1", color = PURPLE);
(a*b)/c+13*d
ur code
another line
\[ {\frac {ab}{c}}+13\,d \]
(a*b)/c+13*d \[ {\frac {ab}{c}}+13\,d \]
Two n-by-n matrices A and B are called similar if there exists an invertible n-by-n matrix S such that