Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.
Shop the 25 must-have electronics for teens and tweens, including light strips, screen magnifiers, and AirPods.
The 94-year-old doyenne of British abstract art on influences from Seurat to Mondrian, her wartime childhood in Cornwall — ...
Abstract: Switched-capacitor converters (SCCs) are transcribed as ladder diagrams and are analyzed at different complexity levels: (1) ideal SCC with no load; (2) SCC with finite load and infinite ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback