Three revolutions in the kernel are worse than one
classification
🧮 math.CA
math.AP
keywords
kernelargumentcomplexnumberreverseswhoseboundedcauchy
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An example is constructed of a purely unrectifiable measure $\mu$ for which the singular integral operator whose kernel triples and reverses the argument of a complex number is bounded $L^2(\mu)$. This is in sharp contrast with the results known for the Cauchy transform, whose kernel reverses the argument of a complex number.
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