let x0 be Real; :: thesis: for f1, f2 being PartFunc of REAL ,REAL st f1 is_right_convergent_in x0 & f2 is_right_convergent_in x0 & lim_right f2,x0 <> 0 & ( for r being Real st x0 < r holds
ex g being Real st
( g < r & x0 < g & g in dom (f1 / f2) ) ) holds
( f1 / f2 is_right_convergent_in x0 & lim_right (f1 / f2),x0 = (lim_right f1,x0) / (lim_right f2,x0) )
let f1, f2 be PartFunc of REAL ,REAL ; :: thesis: ( f1 is_right_convergent_in x0 & f2 is_right_convergent_in x0 & lim_right f2,x0 <> 0 & ( for r being Real st x0 < r holds
ex g being Real st
( g < r & x0 < g & g in dom (f1 / f2) ) ) implies ( f1 / f2 is_right_convergent_in x0 & lim_right (f1 / f2),x0 = (lim_right f1,x0) / (lim_right f2,x0) ) )
assume A1: ( f1 is_right_convergent_in x0 & f2 is_right_convergent_in x0 & lim_right f2,x0 <> 0 & ( for r being Real st x0 < r holds
ex g being Real st
( g < r & x0 < g & g in dom (f1 / f2) ) ) ) ; :: thesis: ( f1 / f2 is_right_convergent_in x0 & lim_right (f1 / f2),x0 = (lim_right f1,x0) / (lim_right f2,x0) )
A2: f1 / f2 = f1 (#) (f2 ^ ) by RFUNCT_1:47;

now

let r be Real; :: thesis: ( x0 < r implies ex g being Real st
( g < r & x0 < g & g in dom f2 & f2 . g <> 0 ) )
assume x0 < r ; :: thesis: ex g being Real st
( g < r & x0 < g & g in dom f2 & f2 . g <> 0 )
then consider g being Real such that
A3: ( g < r & x0 < g & g in dom (f1 / f2) ) by A1;
take g = g; :: thesis: ( g < r & x0 < g & g in dom f2 & f2 . g <> 0 )
thus ( g < r & x0 < g ) by A3; :: thesis: ( g in dom f2 & f2 . g <> 0 )
dom (f1 / f2) = (dom f1) /\ ((dom f2) \ (f2 " {0 })) by RFUNCT_1:def 4;
then A4: g in (dom f2) \ (f2 " {0 }) by A3, XBOOLE_0:def 4;
then ( g in dom f2 & not g in f2 " {0 } ) by XBOOLE_0:def 5;
then not f2 . g in {0 } by FUNCT_1:def 13;
hence ( g in dom f2 & f2 . g <> 0 ) by A4, TARSKI:def 1, XBOOLE_0:def 5; :: thesis: verum

end;

then A5: ( f2 ^ is_right_convergent_in x0 & lim_right (f2 ^ ),x0 = (lim_right f2,x0) " ) by A1, Th66;
hence f1 / f2 is_right_convergent_in x0 by A1, A2, Th67; :: thesis: lim_right (f1 / f2),x0 = (lim_right f1,x0) / (lim_right f2,x0)
thus lim_right (f1 / f2),x0 = (lim_right f1,x0) * ((lim_right f2,x0) " ) by A1, A2, A5, Th67
.= (lim_right f1,x0) / (lim_right f2,x0) by XCMPLX_0:def 9 ; :: thesis: verum