Calculation: A representation of a network of electromagnetic waveguides (left) being used to solve Dirichlet boundary value problems. The coloured diagrams at right represent the normalized ...

As waves travel, they set up patterns of disturbance. The amplitude of a wave is its maximum disturbance from rest (its undisturbed position). Key fact It is important to note that the amplitude is ...

The novel coronavirus has derailed everyday existence for all of us, forcing us to make difficult choices. But a few weeks ago, Stephen Wolfram’s dilemma was unique. What should you do, he wondered, ...