223/71 and 22/7
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There is no difference between improper subset and equal sets. If A is an improper subset of B then A = B. For this reason, the term "improper subset" is rarely used.
No difference.
the difference between two equal fractions is zero.
Archimedes is especially important for his discovery of the relation between the surface and volume of a sphere and its circumscribing cyclinder. He is known for his formulation of a hydrostatic principle (known as Archimedes' principle) and a device for raising water, still used in developing countries, known as the Archimedes screw.
There are many fractions between 9.4 and 9.45! For instance: 9 400947094/1000000000 is between these numbers.