let P be non empty Subset of (); :: thesis: for p1, p2, q1, q2 being Point of ()
for g being Function of I,()
for s1, s2 being Real st P is_an_arc_of p1,p2 & g is continuous & g is one-to-one & rng g = P & g . 0 = p1 & g . 1 = p2 & g . s1 = q1 & 0 <= s1 & s1 <= 1 & g . s2 = q2 & 0 <= s2 & s2 <= 1 & s1 <= s2 holds
LE q1,q2,P,p1,p2

let p1, p2, q1, q2 be Point of (); :: thesis: for g being Function of I,()
for s1, s2 being Real st P is_an_arc_of p1,p2 & g is continuous & g is one-to-one & rng g = P & g . 0 = p1 & g . 1 = p2 & g . s1 = q1 & 0 <= s1 & s1 <= 1 & g . s2 = q2 & 0 <= s2 & s2 <= 1 & s1 <= s2 holds
LE q1,q2,P,p1,p2

let g be Function of I,(); :: thesis: for s1, s2 being Real st P is_an_arc_of p1,p2 & g is continuous & g is one-to-one & rng g = P & g . 0 = p1 & g . 1 = p2 & g . s1 = q1 & 0 <= s1 & s1 <= 1 & g . s2 = q2 & 0 <= s2 & s2 <= 1 & s1 <= s2 holds
LE q1,q2,P,p1,p2

let s1, s2 be Real; :: thesis: ( P is_an_arc_of p1,p2 & g is continuous & g is one-to-one & rng g = P & g . 0 = p1 & g . 1 = p2 & g . s1 = q1 & 0 <= s1 & s1 <= 1 & g . s2 = q2 & 0 <= s2 & s2 <= 1 & s1 <= s2 implies LE q1,q2,P,p1,p2 )
assume that
A1: P is_an_arc_of p1,p2 and
A2: ( g is continuous & g is one-to-one & rng g = P ) ; :: thesis: ( not g . 0 = p1 or not g . 1 = p2 or not g . s1 = q1 or not 0 <= s1 or not s1 <= 1 or not g . s2 = q2 or not 0 <= s2 or not s2 <= 1 or not s1 <= s2 or LE q1,q2,P,p1,p2 )
ex f being Function of I,(() | P) st
( f = g & f is being_homeomorphism ) by ;
hence ( not g . 0 = p1 or not g . 1 = p2 or not g . s1 = q1 or not 0 <= s1 or not s1 <= 1 or not g . s2 = q2 or not 0 <= s2 or not s2 <= 1 or not s1 <= s2 or LE q1,q2,P,p1,p2 ) by ; :: thesis: verum