adjusting format

lectures/14_operators/README.md

@@ -4,18 +4,12 @@
 
 ## 14.1 Complex Numbers — A Brief Review
 
-- Complex numbers take the form z = a + bi, where i =
+- Complex numbers take the form z = a + bi, where i = √−1 and a and b are real. a is called the real part, b is called the imaginary part.
-√
-−1 and a and b are real. a is called the real part, b is
-called the imaginary part.
 - If w = c + di, then  
   – w + z = (a + c) + (b + d)i, 
   – w − z = (a − c) + (b − d)i, and 
   – w × z = (ac − bd) + (ad + bc)i 
-- The magnitude of a complex number is √
+- The magnitude of a complex number is &radic;a<sup>2</sup> + b<sup>2</sup>;
-a
-2 + b
-2
 
 ## 14.2 Complex Class declaration (complex.h)