dk_i -> dk in "Diversifier derivation" section

zip-0032.rst

@@ -228,17 +228,17 @@ CDKfvk((*ak*\ :sub:`par`\ , *nk*\ :sub:`par`\ , *ovk*\ :sub:`par`\ , *dk*\ :sub:
 Diversifier derivation
 ----------------------
 
-The 88-bit diversifiers for a Sapling extended key are derived from its diversifier key *dk*\ :sub:`i`\ .
+The 88-bit diversifiers for a Sapling extended key are derived from its diversifier key *dk*.
 In order to reach the maximum possible diversifier range without running into the birthday bound, we use
 FF1-AES256 as a Pseudo-Random Permutation as follows:
 
 - Let *j* be the index of the desired diversifier, in the range 0 .. 2\ :sup:`88`\ -1.
-- *d*\ :sub:`i,j` = FF1-AES256.Encrypt(*dk*\ :sub:`i`\ , "", I2LEBSP\ :sub:`88`\ (*j*)).
+- *d*\ :sub:`j` = FF1-AES256.Encrypt(*dk*, "", I2LEBSP\ :sub:`88`\ (*j*)).
 
-A valid diversifier *d*\ :sub:`i,j` is one for which DiversifyHash(*d*\ :sub:`i,j`) ≠ ⊥.
-For a given *dk*\ :sub:`i`\ , approximately half of the possible values of *j* yield valid diversifiers.
+A valid diversifier *d*\ :sub:`j` is one for which DiversifyHash(*d*\ :sub:`j`) ≠ ⊥.
+For a given *dk*, approximately half of the possible values of *j* yield valid diversifiers.
 
-The default diversifier for a Sapling extended key is defined to be *d*\ :sub:`i,j`\ , where *j* is the
+The default diversifier for a Sapling extended key is defined to be *d*\ :sub:`j`\ , where *j* is the
 least nonnegative integer yielding a valid diversifier.