Peetre's inequality
Encyclopedia
In mathematics, Peetre's inequality, named after Jaak Peetre, says that for any real number
Real number
In mathematics, a real number is a value that represents a quantity along a continuum, such as -5 , 4/3 , 8.6 , √2 and π...

 t and any vector
Vector space
A vector space is a mathematical structure formed by a collection of vectors: objects that may be added together and multiplied by numbers, called scalars in this context. Scalars are often taken to be real numbers, but one may also consider vector spaces with scalar multiplication by complex...

s x and y in Rn, the following inequality holds:
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x
OK