fixed bernoulli and renamed heaviside link

content/Bernoulli equations (lec 3).md

@@ -17,8 +17,8 @@ $y^{-n}\frac{ dy }{ dx }=\frac{ du }{ dx }{\frac{1}{1-n}}$
 substituting in we get:
 $y^{-n}\frac{ dy }{ dx }+P(x)u=Q(x)=\frac{ du }{ dx }{\frac{1}{1-n}+P(x)u}$
 
-and we get a linear equation again: (Handy formula if you wanna solve specific Bernoulli equations quick.)
-$$\frac{1}{1-n}\frac{ du }{ dx }+P(x)=Q(x)\quad \Box$$
+and we get a linear equation again: (Handy formula if you wanna solve Bernoulli equations quick. Just remember that once you find $u(x)$, substitute it back for $y(x)^{1-n}=u(x)$ to get your solution for y.)
+$$\frac{1}{1-n}\frac{ du }{ dx }+P(x)u=Q(x)\quad \Box$$
 >Remember when I said that when n=1 the equation becomes a separable equation?:
 >$y^{-n}\frac{ dy }{ dx }+P(x)y^{1-n}=Q(x)$
 >let $n=1$