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грн75.00 -10% Off грн67.50
On the path of its development, mathematics periodically experiences turning points, and these crises each time force thinkers to open more and more new hori...
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грн90.00 -10% Off грн81.00
In 1881, the French scientist Henri Poincaré wrote: “Mathematics is just the history of groups.” Today we can confidently assert that this statement is true...