By ΠΠΌΠΈΡΡΠΈΠ΅Π²Π° ΠΠ°Π»Π΅Π½ΡΠΈΠ½Π° ΠΠ΅Π½Π½Π°Π΄ΡΠ΅Π²Π½Π°
ΠΠ½ΠΈΠ³Π° ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΠ΅ΠΉ.
The book is dedicated to the development of mathematical abilities.
US: temporary delays β postal services aligning new import rules, 
Europe: 1β2 weeks, π Worldwide: 1β4 weeks βοΈ