environ
vocabularies HIDDEN, XXREAL_0, NUMBERS, ARYTM_2, SUBSET_1, ARYTM_3, ZFMISC_1, CARD_1, XCMPLX_0, REAL_1;
notations HIDDEN, TARSKI, ZFMISC_1, SUBSET_1, ARYTM_2, ORDINAL1, NUMBERS, XXREAL_0, XREAL_0;
definitions ;
theorems XBOOLE_0, ARYTM_0, ARYTM_1, XREAL_0, NUMBERS, XXREAL_0, XTUPLE_0;
schemes ;
registrations ARYTM_2, XREAL_0, ORDINAL1;
constructors HIDDEN, ARYTM_2, NUMBERS, XXREAL_0, XREAL_0;
requirements HIDDEN, SUBSET, BOOLE;
equalities ORDINAL1;
expansions ;
Lm1:
for x, y being Real st x <= y & y <= x holds
x = y
Lm2:
for x, y, z being Real st x <= y & y <= z holds
x <= z