[Analysis] Start new section

semester3/analysis-ii/parts/diffeq/linear-ode/00_intro.tex

@@ -1,2 +1,5 @@
-\newsection
+\newsectionNoPB
 \subsection{Linear Differential Equations}
+\compactdef{Linear differential equation of order $k$}
+$y^{(k)} + a_{k - 1}y^{(k - 1)} + \ldots + a_1 y' + a_0 y = b$, with $a_i$ and $b$ functions in $x$. 
+If $b(x) = 0 \smallhspace \forall x$, \bi{homogeneous}, else \bi{inhomogeneous}