Inverse theorems for functions in ๐ฟ_{๐} and other spaces
Inverse theorems for functions in ๐ฟ_{๐} and other spaces
Inverse theorem proved by R. De Vore for <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper C left-parenthesis negative normal infinity comma normal infinity right-parenthesis"> <mml:semantics> <mml:mrow> <mml:mi>C</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mo>โ<!-- โ --></mml:mo> <mml:mi mathvariant="normal">โ<!-- โ --></mml:mi> <mml:mo>,</mml:mo> <mml:mi mathvariant="normal">โ<!-- โ --></mml:mi> <mml:mo stretchy="false">)</mml:mo> </mml:mrow> <mml:annotation encoding="application/x-tex">C( - \infty ,\infty )</mml:annotation> </mml:semantics> </mml:math> โฆ