let p be 5 _or_greater Prime; :: thesis: for z being Element of EC_WParam p
for P, Q being Element of EC_SetProjCo ((z `1),(z `2),p)
for a being Element of (GF p) st a <> 0. (GF p) & P `1_3 = a * (Q `1_3) & P `2_3 = a * (Q `2_3) & P `3_3 = a * (Q `3_3) holds
P _EQ_ Q

let z be Element of EC_WParam p; :: thesis: for P, Q being Element of EC_SetProjCo ((z `1),(z `2),p)
for a being Element of (GF p) st a <> 0. (GF p) & P `1_3 = a * (Q `1_3) & P `2_3 = a * (Q `2_3) & P `3_3 = a * (Q `3_3) holds
P _EQ_ Q

let P, Q be Element of EC_SetProjCo ((z `1),(z `2),p); :: thesis: for a being Element of (GF p) st a <> 0. (GF p) & P `1_3 = a * (Q `1_3) & P `2_3 = a * (Q `2_3) & P `3_3 = a * (Q `3_3) holds
P _EQ_ Q

let a be Element of (GF p); :: thesis: ( a <> 0. (GF p) & P `1_3 = a * (Q `1_3) & P `2_3 = a * (Q `2_3) & P `3_3 = a * (Q `3_3) implies P _EQ_ Q )
assume that
A1: a <> 0. (GF p) and
A2: ( P `1_3 = a * (Q `1_3) & P `2_3 = a * (Q `2_3) & P `3_3 = a * (Q `3_3) ) ; :: thesis: P _EQ_ Q
reconsider PP = P, QQ = Q as Element of ProjCo (GF p) ;
A3: PP `1_3 = a * (Q `1_3) by
.= a * (QQ `1_3) by EC_PF_2:32 ;
A4: PP `2_3 = a * (Q `2_3) by
.= a * (QQ `2_3) by EC_PF_2:32 ;
PP `3_3 = a * (Q `3_3) by
.= a * (QQ `3_3) by EC_PF_2:32 ;
hence P _EQ_ Q by ; :: thesis: verum