O bodech obratu
O evolutách křivek rovinných
O křížnici a střížnici
O kuželosečkách a jich kruzích zakřivenosti
O ploském obsahu kruhového výkrojku
O symbolech analytické geometrie a jejich upotřebení. [III.]
O symbolech analytické geometrie a jejich upotřebení. [IV.]
O symbolech analytické geometrie a jejich upotřebení. [V.]
O symbolech analytické geometrie a jich upotřebení. [I.]
O symbolech analytické geometrie a jich upotřebení. [II.]
On Barbier's theorem
On curves and surfaces in illumination geometry.
On kinematics and differential geometry of Euclidean submanifolds.
On L2 and L3.
On Mannheim partner curve in dual space.
On osculating spheres to rectifiable curves
On Poncelet's porism
We consider circular annuli with Poncelet's porism property. We prove two identities which imply Chapple's, Steiner's and other formulas. All porisms can be expressed in the form in which elliptic functions are not used.
On rectifying dual space curves.
On rosettes and antipodal rosettes.
On Schrödinger maps from to
We prove an estimate for the difference of two solutions of the Schrödinger map equation for maps from to This estimate yields some continuity properties of the flow map for the topology of , provided one takes its quotient by the continuous group action of given by translations. We also prove that without taking this quotient, for any the flow map at time is discontinuous as a map from , equipped with the weak topology of to the space of distributions The argument relies in an essential...