Use \text macro to make numbers subscript

More details, see 488ee5279a

sphinx/util/texescape.py

@@ -47,26 +47,26 @@ tex_replacements = [
     ('│', r'\textbar{}'),
     ('ℯ', r'e'),
     ('ⅈ', r'i'),
-    ('⁰', r'$^0$'),
-    ('¹', r'$^1$'),
-    ('²', r'$^2$'),
-    ('³', r'$^3$'),
-    ('⁴', r'$^4$'),
-    ('⁵', r'$^5$'),
-    ('⁶', r'$^6$'),
-    ('⁷', r'$^7$'),
-    ('⁸', r'$^8$'),
-    ('⁹', r'$^9$'),
-    ('₀', r'$_0$'),
-    ('₁', r'$_1$'),
-    ('₂', r'$_2$'),
-    ('₃', r'$_3$'),
-    ('₄', r'$_4$'),
-    ('₅', r'$_5$'),
-    ('₆', r'$_6$'),
-    ('₇', r'$_7$'),
-    ('₈', r'$_8$'),
-    ('₉', r'$_9$'),
+    ('⁰', r'$^\text{0}$'),
+    ('¹', r'$^\text{1}$'),
+    ('²', r'$^\text{2}$'),
+    ('³', r'$^\text{3}$'),
+    ('⁴', r'$^\text{4}$'),
+    ('⁵', r'$^\text{5}$'),
+    ('⁶', r'$^\text{6}$'),
+    ('⁷', r'$^\text{7}$'),
+    ('⁸', r'$^\text{8}$'),
+    ('⁹', r'$^\text{9}$'),
+    ('₀', r'$_\text{0}$'),
+    ('₁', r'$_\text{1}$'),
+    ('₂', r'$_\text{2}$'),
+    ('₃', r'$_\text{3}$'),
+    ('₄', r'$_\text{4}$'),
+    ('₅', r'$_\text{5}$'),
+    ('₆', r'$_\text{6}$'),
+    ('₇', r'$_\text{7}$'),
+    ('₈', r'$_\text{8}$'),
+    ('₉', r'$_\text{9}$'),
     # map Greek alphabet
     ('α', r'\(\alpha\)'),
     ('β', r'\(\beta\)'),