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Geometric Triple


A geometric triple is a triple (a,b,c) of positive integers satisfying a<b<c for which ac=b^2. In particular, such a triple is geometric if its terms form a geometric sequence with common ratio r where

 r=b/a.

There is a one-to-one correspondence between the set of equivalence classes of geometric triples and the set of equivalence classes of harmonic triples satisfying a<b<c and 1/a+1/c=2/b (VanderBurgh 2010, pp. 141-143). Here, two triples (a,b,c) and (u,v,w) belong to the same equivalence class iff a:b:c=u:v:w, i.e., if there exists some positive real number k in R such that (a,b,c)=(ku,kv,kw).


See also

Common Ratio, Equivalence Class, Equivalence Relation, Geometric Sequence, Harmonic Triple

Portions of this entry contributed by Christopher Stover

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References

VanderBurgh, I. (Ed.). "Mathematical Mayhem: Mayhem Solutions." Crux Math. 36, 141-143, 2010. https://cms.math.ca/wp-content/uploads/crux-pdfs/CRUXv36n3.pdf.

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Geometric Triple

Cite this as:

Weisstein, Eric W., with contributions by Christopher Stover. "Geometric Triple." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/GeometricTriple.html

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