That leads to the questions: 1) When is it appropriate to introduce new equations? (judithcurry.com)
He and Deffner chose to test, using new equations they developed, whether one specific quantum field theory held true in the rare case of a system of extremely small size and extremely high energy — and it did. (sciencedaily.com)
Basal metabolic rate studies in humans: measurement and development of new equations. (completehumanperformance.com)