On the Timelike Sweeping Surfaces and Singularities in Minkowski 3-Space <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <msubsup> <mrow> <mi mathvariant="double-struck">E</mi> </mrow> <mrow> <mn>1</mn> </mrow> <mrow> <mn>3</mn> </mrow> </msubsup> </math>
Abstract and applied analysis