corrected some pages

Several small corrections were done to several proofs and definitions.

Author: JoramSoch

P/pdf-sdfct.md

@@ -45,7 +45,7 @@ $$ \label{eq:Y-range}
 $$
 
 
-**Proof:** The [cumulative distribution function of a strictly decreasing function](/P/cdf-sifct) is
+**Proof:** The [cumulative distribution function of a strictly decreasing function](/P/cdf-sdfct) is
 
 $$ \label{eq:cdf-sdfct}
 F_Y(y) = \left\{

P/t-pdf.md

@@ -87,7 +87,7 @@ J &= \left[ \begin{matrix}
 \frac{\mathrm{d}Y}{\mathrm{d}T} & \frac{\mathrm{d}Y}{\mathrm{d}W}
 \end{matrix} \right]
 = \left[ \begin{matrix}
-\sqrt{\frac{W}{\nu}} & \frac{T}{2 \sqrt{W/\nu}} \\
+\sqrt{\frac{W}{\nu}} & \frac{T}{2 \nu \sqrt{W/\nu}} \\
 0 & 1
 \end{matrix} \right] \\
 \lvert J \rvert  &= \sqrt{\frac{W}{\nu}} \; .