On Commutation Properties of the Composition Relation of Convergent and Divergent Permutations (Part I)
Wituła, Roman, Hetmaniok, Edyta, Słota, Damian
On Certain Approximation Problem Connected with the Sums of Subseries
Wituła, Roman, Kaczmarek, Konrad, Hetmaniok, Edyta, Słota, Damian
Some variation on the Riemann derangement theorem
Wituła, Roman, Hetmaniok, Edyta, Słota, Damian