A bijection between atomic partitions and unsplitable partitions.
A generalization of Stirling numbers of the second kind via a special multiset.
A left weighted Catalan extension.
A -analogue of a formula of Frobenius.
A partition of R in two homogeneous and homeomorphic parts
A partition theorem for α-large sets
A problem of Schur and its generalizations
A topology with order, graph and an enumeration problem.
Admissible functions and asymptotics for labelled structures by number of components.
Advanced determinant calculus.