Added more facts about the positive square root.

document.tex

@@ -6,6 +6,8 @@
 
 Hi, welcome to my digital garden, where I collect math results that I learn. 
 
+Despite being presented in a linear order, I will frequently reference things between chapters and sections. 
+
 Occasionally, I make up some definitions to play with. These definition blocks will always have a * at the end of its title to indicate that it lives mostly in my head. These terms will always be referenced with a link to their definition block. 
 
 \input{./src/cat/index}