[Analysis] Notes and cleanup

Notes for tangent space computation and green's formula.
Also includes fixes for the pagination as result of additions

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

@@ -1,6 +1,6 @@
 \newsectionNoPB
 \subsection{Linear Differential Equations}
-An ODE is considered linear if and only if the $y$s are only scaled and not part of powers.\\
+An ODE is considered \bi{linear} if and only if the $y$s are only scaled and not part of powers.\\
 \compactdef{Linear differential equation of order $k$} (order = highest derivative)
 $y^{(k)} + a_{k - 1}y^{(k - 1)} + \ldots + a_1 y' + a_0 y = b$, with $a_i$ and $b$ functions in $x$.
 If $b(x) = 0 \smallhspace \forall x$, \bi{homogeneous}, else \bi{inhomogeneous}\\