diff --git a/math/lexer.mll b/math/lexer.mll
index 56c166d47..db2cbda98 100644
--- a/math/lexer.mll
+++ b/math/lexer.mll
@@ -66,7 +66,7 @@ rule token = parse
   | "\\" (latex_function_names as name) space * "\\{"  
                                 { LITERAL (MHTMLABLEFC(FONT_UFH, "\\" ^ name ^ "\\{", name ^ "{", MF, name, "{")) }
   | "\\" (latex_function_names as name) space * 
-                                { LITERAL (MHTMLABLEC(FONT_UFH,"\\" ^ name, name ^ " ", MF, name)) }
+                                { LITERAL (MHTMLABLEC(FONT_UFH,"\\" ^ name ^ " ", name ^ " ", MF, name)) }
   | "\\" (mediawiki_function_names as name) space * "("  
                                 { (Texutil.tex_use_ams(); LITERAL (MHTMLABLEFC(FONT_UFH,
                                    "\\operatorname{" ^ name ^ "}(", name ^ "(", MF, name, "("))) }
@@ -77,7 +77,7 @@ rule token = parse
                                 { (Texutil.tex_use_ams(); LITERAL (MHTMLABLEFC(FONT_UFH,
                                    "\\operatorname{" ^ name ^ "}\\{", name ^ "{", MF, name, "{"))) }
   | "\\" (mediawiki_function_names as name) space *
-                                { (Texutil.tex_use_ams(); LITERAL (MHTMLABLEC(FONT_UFH,"\\operatorname{" ^ name ^ "}", name ^ " ", MF, name))) }
+                                { (Texutil.tex_use_ams(); LITERAL (MHTMLABLEC(FONT_UFH,"\\operatorname{" ^ name ^ "} ", name ^ " ", MF, name))) }
   | "\\" alpha + 		{ Texutil.find (Lexing.lexeme lexbuf) }
   | "\\," 			{ LITERAL (HTMLABLE (FONT_UF, "\\,"," ")) }
   | "\\ " 			{ LITERAL (HTMLABLE (FONT_UF, "\\ "," ")) }
diff --git a/math/texutil.ml b/math/texutil.ml
index efbf6a38f..c9c89e5b9 100644
--- a/math/texutil.ml
+++ b/math/texutil.ml
@@ -269,10 +269,6 @@ let find = function
     | "\\limits"           -> LITERAL (TEX_ONLY "\\limits ")
     | "\\nolimits"         -> LITERAL (TEX_ONLY "\\nolimits ")
     | "\\top"              -> LITERAL (TEX_ONLY "\\top ")
-    | "\\arccot"           -> (tex_use_ams (); LITERAL (HTMLABLEC(FONT_UFH,"\\mathop{\\mathrm{arccot}}","arccot")))
-    | "\\arcsec"           -> (tex_use_ams (); LITERAL (HTMLABLEC(FONT_UFH,"\\mathop{\\mathrm{arcsec}}","arcsec")))
-    | "\\arccsc"           -> (tex_use_ams (); LITERAL (HTMLABLEC(FONT_UFH,"\\mathop{\\mathrm{arccsc}}","arccsc")))
-    | "\\sgn"              -> (tex_use_ams (); LITERAL (HTMLABLEC(FONT_UFH,"\\mathop{\\mathrm{sgn}}","sgn")))
     | "\\bullet"           -> LITERAL (HTMLABLE (FONT_UFH, "\\bullet ", "•"))
     | "\\bull"             -> LITERAL (HTMLABLE (FONT_UFH, "\\bullet ", "•"))
     | "\\angle"            -> (tex_use_ams (); LITERAL (HTMLABLE (FONT_UF, "\\angle ", "∠")))