let R, S be non empty right_complementable Abelian add-associative right_zeroed associative well-unital distributive doubleLoopStr ; :: thesis: for P being Function of R,S st P is RingIsomorphism & R is Noetherian holds
S is Noetherian
let P be Function of R,S; :: thesis: ( P is RingIsomorphism & R is Noetherian implies S is Noetherian )
assume A1:
( P is RingIsomorphism & R is Noetherian )
; :: thesis: S is Noetherian
now let I be
Ideal of
S;
:: thesis: I is finitely_generated reconsider PI =
(P " ) .: I as
Ideal of
R by A1, Th22, Th25;
PI is
finitely_generated
by A1, IDEAL_1:def 27;
then consider F being non
empty finite Subset of
R such that A2:
(P " ) .: I = F -Ideal
by IDEAL_1:def 26;
(
P is
RingMonomorphism &
P is
RingEpimorphism )
by A1, QUOFIELD:def 24;
then A3:
(
P is
one-to-one &
rng P = the
carrier of
S )
by QUOFIELD:def 22, QUOFIELD:def 23;
then
P " = P "
by TOPS_2:def 4;
then A4:
P .: ((P " ) .: I) = P .: (P " I)
by A3, FUNCT_1:155;
P is
RingEpimorphism
by A1, QUOFIELD:def 24;
then
rng P = the
carrier of
S
by QUOFIELD:def 22;
then
P .: ((P " ) .: I) = I
by A4, FUNCT_1:147;
then
I = (P .: F) -Ideal
by A1, A2, Th26;
hence
I is
finitely_generated
;
:: thesis: verum end;
hence
S is Noetherian
by IDEAL_1:def 27; :: thesis: verum