Study of student mistakes in solving simplification problems on paper and possibility of these mistakes in the T-algebra environment

LEPP, Dmitri. Study of student mistakes in solving simplification problems on paper and possibility of these mistakes in the T-algebra environment. In Proceedings of the 8th International Conference on Technology in Mathematics Teaching x, 46 s. + 1 CD-ROM. ISBN 978-80-7041-285-5 (brož.) International Conference on Technology in Mathematics Teaching. Hradec Králové : Gaudeamus, 2007, s. 13-14.