EN
CONTENTS
Introduction....................................................................................................................................... 5
List of categories........................................................................................................................ 8
1. GALOIS CONNECTIONS................................................................................................................... 10
a. The basic theory of Galois connections............................................................................. 10
b. Applications of Galois connections to compact semilattices........................................ 13
c. Supplementary results on Lawson semilattices.............................................................. 16
2. COMPACT ZERO-DIMENSIONAL SEMILATTICES WITH COMPLETE DUAL............................. 19
a. Dual completeness............................................................................................................... 19
b. The compact closure operator............................................................................................. 21
c. Algebraic and order theoretic characterization of Lawson semilattices....................... 24
d. The functoriality of j, c, m......................................................................................................... 28
3. THE (RIGHT) REFLECTOR P : CL → D
a. The ideal lattice......................................................................................................................... 33
b. The morphism $s_L : L → PL$.............................................................................................. 35
c. The functor P : CL → D............................................................................................................. 36
d. PL as a projective object......................................................................................................... 37
4. ON THE FINE STRUCTURE OF PL................................................................................................... 42
a. The construction of A(L).......................................................................................................... 42
b. On the geometric structure of PL........................................................................................... 47
5. EXAMPLES, APPLICATIONS................................................................................................................ 50
Bibliography........................................................................................................................................ 54