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## Secondary language

Language: English IRREDUCIBLE BIQUADRATIC POLYNOMALS WITH FACTORIZATIONS MODULO p The graduation thesis discusses a problem of irreducible biquadratic polynomials with integer coefficients. In the first chapter the theory of congruences is introduced. The second chapter is devoted to the theory of polynomials with rational coefficients. Next, we consider polynomial congruences on the set of all polynomials with integer coefficients. The main part of the thesis deals with biquadratic polynomials which are irreducible in Z[x], but reducible modulo p for every prime number p. In the last chapter we consider irreducible biquadratic polynomials that are reducible modulo n for every integer n>1. biquadratic polynomial, congruence, polynomial, quadratic residue, Legendre symbol