@@ -1947,6 +1947,9 @@ def __init__(self):
19471947 self ._expression = p .main
19481948 self ._math_expression = p .math
19491949
1950+ # To add space to nucleus operators after sub/superscripts
1951+ self ._in_subscript_or_superscript = False
1952+
19501953 def parse (self , s , fonts_object , fontsize , dpi ):
19511954 """
19521955 Parse expression *s* using the given *fonts_object* for
@@ -1965,6 +1968,8 @@ def parse(self, s, fonts_object, fontsize, dpi):
19651968 " " * (err .column - 1 ) + "^" ,
19661969 str (err )])) from err
19671970 self ._state_stack = None
1971+ self ._in_subscript_or_superscript = False
1972+ # prevent operator spacing from leaking into a new expression
19681973 self ._em_width_cache = {}
19691974 self ._expression .resetCache ()
19701975 return result [0 ]
@@ -2164,6 +2169,13 @@ def operatorname(self, s, loc, toks):
21642169 # Add thin space except when followed by parenthesis, bracket, etc.
21652170 hlist_list += [self ._make_space (self ._space_widths [r'\,' ])]
21662171 self .pop_state ()
2172+ # if followed by a super/subscript, set flag to true
2173+ # This flag tells subsuper to add space after this operator
2174+ if next_char in {'^' , '_' }:
2175+ self ._in_subscript_or_superscript = True
2176+ else :
2177+ self ._in_subscript_or_superscript = False
2178+
21672179 return Hlist (hlist_list )
21682180
21692181 def start_group (self , s , loc , toks ):
@@ -2394,8 +2406,15 @@ def subsuper(self, s, loc, toks):
23942406
23952407 if not self .is_dropsub (last_char ):
23962408 x .width += constants .script_space * xHeight
2397- result = Hlist ([nucleus , x ])
23982409
2410+ # Do we need to add a space after the nucleus?
2411+ # To find out, check the flag set by operatorname
2412+ spaced_nucleus = [nucleus , x ]
2413+ if self ._in_subscript_or_superscript :
2414+ spaced_nucleus += [self ._make_space (self ._space_widths [r'\,' ])]
2415+ self ._in_subscript_or_superscript = False
2416+
2417+ result = Hlist (spaced_nucleus )
23992418 return [result ]
24002419
24012420 def _genfrac (self , ldelim , rdelim , rule , style , num , den ):
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