WITH regard to the subject of “Forced Vibrations” dealt with by Prof. Perry in his letter in NATURE of June 27 (p. 424), Prof. E. H. Barton, of Nottingham, puts the matter very clearly on p ...

In 1975, then in his mid-30s, Szemerédi proved that arithmetical progressions of any length — five, 10, 10,000, etc. — can be found in any positive sequence of integers.

Annick Fagnant, Joëlle Vlassis, Schematic representations in arithmetical problem solving: Analysis of their impact on grade 4 students, Educational Studies in Mathematics, Vol. 84, No. 1 (September ...

The study reported here investigated the arithmetical and algebraic problem-solving strategies and skills of preservice primary school and secondary school teachers in Randers, Belgium, both at the ...