Inscribing closed non-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$\sigma$" id="E1"><mml:mi>σ</mml:mi></mml:math>-lower porous sets into Suslin non-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$\sigma$" id="E2"><mml:mi>σ</mml:mi></mml:math>-lower porous sets
Abstract and applied analysis