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Peter M. Higgins has written:
'Techniques of semigroup theory' -- subject(s): Semigroups
A chemical combination of two or more elements is a compound.
A compound is composed of two or more elements.
A compound of only two elements is a binary compound.
When two elements chemically react, the mass of the product is equal to the sum of the two masses of the two elements.
Orval Lester Sweeney has written:
'Numerical properties of the full transformation semigroup on a finite domain' -- subject(s): Mathematics