environ
vocabularies HIDDEN, TOPGEN_6, NUMBERS, SUBSET_1, XXREAL_0, ORDINAL1, FUNCT_1, RELAT_1, XBOOLE_0, TARSKI, ZFMISC_1, CARD_3, CARD_1, COMPLEX1, ARYTM_3, RCOMP_1, ORDINAL2, STRUCT_0, ARYTM_1, REAL_1, TOPGEN_3, CANTOR_1, SETFAM_1, RAT_1, TOPS_1, TOPGEN_1, XXREAL_1, RLVECT_3, PRE_TOPC, CARD_5, TOPMETR, METRIZTS;
notations HIDDEN, TARSKI, XBOOLE_0, ZFMISC_1, RELAT_1, SUBSET_1, SETFAM_1, FUNCT_1, RELSET_1, ORDINAL1, CARD_1, CARD_2, CARD_3, NUMBERS, XCMPLX_0, COMPLEX1, REAL_1, XREAL_0, RAT_1, RCOMP_1, DOMAIN_1, FUNCT_2, STRUCT_0, PRE_TOPC, BORSUK_1, TOPS_1, TOPS_2, CANTOR_1, TOPMETR, TOPGEN_1, TOPGEN_3, XXREAL_0, METRIZTS;
definitions TARSKI, XBOOLE_0, FUNCT_1, WELLORD2, PRE_TOPC, SUBSET_1, STRUCT_0, COMPTS_1, METRIZTS, SETFAM_1, TOPS_2;
theorems TARSKI, XBOOLE_0, XBOOLE_1, ZFMISC_1, FUNCT_1, TOPGEN_3, XREAL_1, XREAL_0, ABSVALUE, YELLOW_9, NUMBERS, CARD_5, SUBSET_1, TOPS_1, PRE_TOPC, TOPGEN_1, RAT_1, CARD_1, CARD_2, CARD_3, CARD_4, BORSUK_1, TOPS_2, FUNCT_2, TOPMETR, XXREAL_1, RELAT_1, CANTOR_1, SETFAM_1, FRECHET, XXREAL_0, XTUPLE_0, METRIZTS, BORSUK_5, TREAL_1, TOPS_4, TOPGEN_5;
schemes CLASSES1, FUNCT_2;
registrations SUBSET_1, FINSET_1, NUMBERS, XCMPLX_0, XXREAL_0, XREAL_0, RAT_1, CARD_1, MEMBERED, STRUCT_0, PRE_TOPC, TOPS_1, BORSUK_1, TOPMETR, RELSET_1, METRIZTS, TOPGEN_4, CARD_3, TOPGEN_5, NAT_1;
constructors HIDDEN, WELLORD2, REAL_1, COMPLEX1, CARD_2, RCOMP_1, TOPS_1, TOPGEN_2, TOPGEN_1, TOPGEN_3, METRIZTS, TOPGEN_5, TOPGEN_4, ORDINAL1, PCOMPS_1;
requirements HIDDEN, BOOLE, SUBSET, NUMERALS, ARITHM, REAL;
equalities TARSKI, XBOOLE_0, FUNCT_1, WELLORD2, PRE_TOPC, SUBSET_1, STRUCT_0, COMPTS_1, METRIZTS, SETFAM_1, TOPS_2;
expansions XXREAL_0, PRE_TOPC;
Lm1:
for f being Function
for x, y being set st x in f " {y} holds
f . x = y
Lm2:
Sorgenfrey-line is T_2
Lm3:
for T being SubSpace of R^1 holds T is Lindelof
Lm4:
for p, r being Real st r > p holds
ex q being Rational st q in [.p,r.[
Lm5:
the carrier of Sorgenfrey-line = REAL
by TOPGEN_3:def 2;
consider BB being Subset-Family of REAL such that
Lm6:
the topology of Sorgenfrey-line = UniCl BB
and
Lm7:
BB = { [.x,q.[ where x, q is Real : ( x < q & q is rational ) }
by TOPGEN_3:def 2;
Lm8:
BB is Basis of Sorgenfrey-line
by Lm5, Lm6, CANTOR_1:1, CANTOR_1:def 2, TOPS_2:64;
Lm9:
Sorgenfrey-line is Lindelof
the carrier of Sorgenfrey-line = REAL
by TOPGEN_3:def 2;
then Lm10:
the carrier of Sorgenfrey-plane = [:REAL,REAL:]
by BORSUK_1:def 2;
Lm11:
for x, y being Real st [x,y] in real-anti-diagonal holds
y = - x
Lm12:
not Sorgenfrey-plane is Lindelof
Lm13:
not Sorgenfrey-plane is normal