diff --git a/无进位乘法和GHASH.md b/无进位乘法和GHASH.md
index b33046b..cb0b36f 100644
--- a/无进位乘法和GHASH.md
+++ b/无进位乘法和GHASH.md
@@ -5,9 +5,9 @@
   * PCLMULQDQ            ```64 x 64 -> 128 (carry-less)```
     * Binary polynomial multiplication; speed up computations in binary fields
   * Using it for AES-GCM:
-  * To use it for GHASH computations: GF(2^128) multiplication:
+  * To use it for GHASH computations: GF($2^{128}$) multiplication:
     1.  Compute ```128 x 128 -> 256``` via carry-less multiplication (of 64-bit operands)
-    2.  Reduction: ```256 -> 128 modulo x^128 + x^7 + x^2 + x + 1``` (done efficiently via software)
+    2.  Reduction: 256 -> 128 modulo $x^{128} + x^7 + x^2 + x + 1$ (done efficiently via software)
 
 # 参考
 * [Cryptographic Hardware and Software and useful architectures](https://www.esat.kuleuven.be/cosic/events/ecrypt-net-school-2018/wp-content/uploads/sites/23/2018/10/kos-school-gueron-2.pdf)