Bulgaria

 

Konstantin DELCHEV (18)

City/Region: Sofia
E-mail: math_k_delchev@yahoo.com
Hobbies: Chess, Opera Music, Mountaineering, Birdwatching
Career: Mathematician
School: Sofia Mathematic High School 'Paisij Hilendarski'

 
On two problems connected with the rectification of polyominoes


Since polyominoes were introduced in mathematics by Solomon Golomb in 1951 the problem for their rectification /tiling a rectangle with them/ is one of the most discussed problems in the field. The project concerns two of the main generalizations of this problem which were studied in the last three decades. These problems are finding of sets of polyominoes or their n-dimentional equivalents which have similar tiling properties and finding the explicit form the function fx(a,b), which gives the number of tilings of an axb rectangle with the polyomino X. In the project we collect some of the already known results in this field and prove new facts concering the L-polyominoes, the boot polyominoes the stepwise n2-ominoes and a group of n-dimensional equivalents of the stepwise hexomino.
 


Ana Ivanova ALEXIEVA (18)

City/Region: Gramada
E-mail: ana_vd_mg@yahoo.com, ana_alexieva@mail.bg
Hobbies: Reading fiction, Writing poetry, Training Folk-dances, Volleyball, Table Tennis, Mountaineering, Listening to music
Career: Mathematician
School: Secondary School of Mathematics "Ekzarch Antim I”

 
Original results on the sequences of Fibonacci & Lucas


The project is devoted to the sequences of Fibonacci and Lucas and consist of: Item one, which contains formulations and proofs of several entirely new theorems, considering divisibility in each sequence and between them both Item two, including original analyses of the prpperies of polygons in the plane and in the space, which co-ordinates are members of the sequences of Fibonacci and Lucas.
Appendix1, Appendix2 and Appendix3 contain propositions, which were used by the proofs of the theorems of the project. All of them were taken from another author’s work and most of them are also original. Appendix4 proposes 13 entirely new problems, which is illustrate the theory explored in the project and in Appendix1, Appendix2 and Appendix3. Appendix5 includes the bibliography used.

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