Sommaire du Fascicule no. 1

Contents
Quasigroups of fractions
p. 3-81

Sommaire du Fascicule no. 2

Foreword
On dense subsets of rational numbers
p. 5-10
A note on complex unions of subsets of the real line
p. 11-15
On almost invariant subsets of the real line
p. 17-21
On the splitting number and Mazurkiewicz's theorem
p. 23-25
On club-like principles on regular cardinals above $\beth\sb \omega$
p. 27-32
On projection of nonseparable Souslin and Borel sets along separable spaces
p. 33-41
Life in the Sacks model
p. 43-58
Location of min-max critical points for multivalued functionals
p. 59-68
A combinatorial theorem for a symmetric triangulation of the sphere $S^2$
p. 69-74
Extendibility of embeddings
p. 75-88
On D.C. mappings and differences of convex operators
p. 89-97