Bi-monotone maps on the set of all variance-covariance matrices with respect to minus partial order

Kepler Triangle, Pythagorean Theorem and Golden Ratio

Generalized circular projections

Nonlinear Birkhoff-James orthogonality preservers in smooth normed spaces

A variant of Wigner's theorem in normed spaces

On isometries with finite spectrum

Phase-isometries between normed spaces

Hermitian projections on some Banach spaces and related topics

Elementary determination of the extrema of a function y =(a_1x^2 + b_1x + c_1)/(a_2x^2 + b_2x + c_2)

Conjugations on Banach *-algebras

On Wigner's theorem in smooth normed spaces

Complexifications of real Banach spaces and their isometries

On Wigner's theorem in strictly convex normed spaces

Pre-Hilbert modules, normed modules and the parallelogram law

An inverse eigenvalue problem for isometries

On isometries and projections on some Banach spaces

When is a finite sum of box operators a Hermitian projection?

When is a finite sum of box operators on a JB*- triple a Hermitian projection?

Isometries, projections and related maps on JB*- triples

On square roots of isometries

Surjective linear isometries with finite spectrum

On superstability of the Wigner equation

On isometries on some Banach spaces - something old, something new, something borrowed, something blue: Part I and Part II

Preservers of isometries

Three topics in isometries

Complexifications of real Banach spaces and their isometries

On isometric roots of isometries

On surjective linear isometries with finite spectrum

On projections arising from isometries with finite spectrum on Banach spaces

Generalized n-circular projections on JB*-triples and Hilbert C_0(Ω)-modules

Generalized n-circular projections on JB*-triples

On a Banach space substitute of the orthogonal projections on Hilbert spaces

On square roots of isometries

Isometries with finite spectrum on continuous functions

A quantitative version of Herstein's theorem for Jordan *-isomorphisms

Generalized tricircular projections on minimal norm ideals in B(H)

Stability of the Wigner equation - a singular case

On generalized n-circular projections

Stability of the Wigner equation - a singular case

Undergraduate and graduate studies of geology at the Faculty of Science of the University in Zagreb

When the average of composition operators being a projection

Generalized Skew Derivations Implemented by Elementary Operators

Orthogonally additive mappings on Hilbert modules

Undergraduate University Programme in Mathematics Education

Functions in the teaching of mathematics - motivational examples from geology

Derivations, automorphisms and elementary operators

On (anti-)multiplicative generalized derivations

When is the Hermitian/skew-Hermitian part of a matrix a potent matrix?

A generalization of the original Jordan - von Neumann theorem

The definition and the name of a class of trapezoid (or why not isosceles trapezoid?)

Reverse of van Aubel theorem

Generalized bicircular projections via rank preserving maps on the spaces of symmetric and antisymmetric operators

On some functional equations related to bicircular projections

Generalized bicircular projections on JB*-triples

Cayley-Dickson construction

On Jordan triple derivations and related mappings

Generalized bicircular projections via the operator equation $\alpha X^2AY^2+\beta XAY+A=0$

Approximately orthogonality preserving mappings on C*-modules

One method of verifying knowledge of elementary geometry

Perturbation of the Wigner equation in inner product C*-modules

On bicircular projections

Jensen and quadratic functional equation

Quadratic functionals and sesquilinear forms

G-invariant norms and bicircular projections

On the Cauchy-Schwarz inequality and its reverse in semi-inner product C*-modules

Bessel and Grüss type inequalities in inner product modules

Application of the Rasch model to the analysis of the entrance exams

On additivity of centralisers

Learning, teaching and discovering geometry by geometric constructions carried out using a program of dynamic geometry

On a class of projections on *-rings

Quadratic functionals on modules over *-rings

Quadratic functionals on modules over complex Banach-algebras with an approximate identity

Gruss type inequalities in inner product modules

System of equations

Quadratic functionals on modules over alternative *-rings

Classification exam on Department of Mathematics

Quadratic Functionals and Sesquilinear Forms

Equations arising from Jordan *-derivation pairs

On quadratic functionals - from *-rings to a class of Banach *-algebras

Molnar-dependence in a pre-Hilbert module over an H*-algebra

On redundance of one of the axioms of a generalized normed space

A new approach to the Jordan-von Neumann type theorem for pre-Hilbert modules over H*-algebras

H*-algebras and Hilbert H*-modules

Finsler-Hadwiger inequality and its consequences