Fix cw.tex

cw/cw.tex

@@ -63,7 +63,7 @@
 	For if the block size is bigger than one we can say
 	$$H(m)=E(m)_{\text{Last Block}}$$
 	$$E(m)=E(K, m)$$
-	$$\exists a,b,c,d : m = a||b \and m' = c||d$$
+	$$\exists a,b,c,d : m = a||b \land m' = c||d$$
 	where a,b,c,d are the size of one block
 	$$H(m)=E(b \oplus E(a \oplus IV)) = C_1$$
 	$$H(m')=E(d \oplus E(c \oplus IV)) = C_2$$
@@ -72,7 +72,7 @@
 	with:
 	$$a \ne b \ne c \ne d$$
 	therefore
-	$$H(m)=H(m') \and m\ne m'$$
+	$$H(m)=H(m') \land m\ne m'$$