Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

Abstract: Java Object-Oriented Programming (OOP) is vital in information technology, but students often struggle with abstract concepts and complex logic. This study applies the Block Model (BM) to ...

Black and white print with tint of the floor plan of the New York State Assembly giving the names of the assemblymen and their seat numbers. A small view in the lower ...