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2. Power residue symbol - Wikipedia

   en.wikipedia.org/wiki/Power_residue_symbol

   In algebraic number theory the n-th power residue symbol (for an integer n > 2) is a generalization of the (quadratic) Legendre symbol to n-th powers. These symbols are used in the statement and proof of cubic , quartic , Eisenstein , and related higher [ 1 ] reciprocity laws .

3. Foam rubber - Wikipedia

   en.wikipedia.org/wiki/Foam_rubber

   Foam rubber was first made in 1929, by E. A. Murphy [2] and Eric Owen, two research chemists at Dunlop Rubber, who used whipped latex. In 1937, isocyanate-based materials were first used to make foam rubber. After World War II, styrene-butadiene rubber replaced many natural types of foam. Foam rubber has been used commercially for a wide range ...

4. Orders of magnitude (power) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(power)

   10 9: giga-(GW) 1.3 × 10 9. tech: electric power output of Manitoba Hydro Limestone hydroelectric generating station 2.074 × 10 9: tech: peak power generation of Hoover Dam: 2.1 × 10 9: tech: peak power generation of Aswan Dam: 3.4 × 10 9: tech: estimated power consumption of the Bitcoin network in 2017 [29] 4.116 × 10 9

5. Natural rubber - Wikipedia

   en.wikipedia.org/wiki/Natural_rubber

   (1997) Brazil and the Struggle for Rubber: A Study in Environmental History. Cambridge University Press. Grandin, Greg. Fordlandia: The Rise and Fall of Henry Ford's Forgotten Jungle City. Picador Press 2010. ISBN 978-0-312-42962-1; Weinstein, Barbara (1983) The Amazon Rubber Boom 1850–1920. Stanford University Press. Tully, John A.

6. 4 × 400 meter relay at the NCAA Division I Outdoor Track and ...

   en.wikipedia.org/wiki/4_×_400_meter_relay_at_the...

   This is a list of the NCAA Division I outdoor champions in the 4 × 440-yard relay until 1975, and the metric 4 × 400 meter relay since metrication occurred in 1976. Hand timing was used until 1973, while starting in 1974 fully automatic timing was used.

7. Falling and rising factorials - Wikipedia

   en.wikipedia.org/wiki/Falling_and_rising_factorials

   When is a positive integer, () gives the number of n-permutations (sequences of distinct elements) from an x-element set, or equivalently the number of injective functions from a set of size to a set of size .