Peetre's inequality

In mathematics, Peetre's inequality, named after Jaak Peetre, says that for any real number t and any vectors x and y in Rⁿ, the following inequality holds:

\left({\frac {1+|x|^{2}}{1+|y|^{2}}}\right)^{t}\leq 2^{|t|}(1+|x-y|^{2})^{|t|}.

References

Chazarain, J.; Piriou, A. (2011), Introduction to the Theory of Linear Partial Differential Equations, Studies in Mathematics and its Applications, Elsevier, p. 90, ISBN 9780080875354.
Ruzhansky, Michael; Turunen, Ville (2009), Pseudo-Differential Operators and Symmetries: Background Analysis and Advanced Topics, Pseudo-Differential Operators, Theory and Applications, 2, Springer, p. 321, ISBN 9783764385132.
Saint Raymond, Xavier (1991), Elementary Introduction to the Theory of Pseudodifferential Operators, Studies in Advanced Mathematics, 3, CRC Press, p. 21, ISBN 9780849371585.

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