equivalence of mass and energyequivalence of pathsequivalence of two arrowsequivalence problemequivalence relationequivalentequivalent affinityequivalent annual costequivalent assertionsequivalent criteriaequivalent electrical circuitequivalent elementsequivalent equationsequivalent eventsequivalent figuresequivalent fractionsequivalent ineqalitiesequivalent inequalitiesequivalent matricesequivalent representationequivalent setsequivalent solidsequivalent transformationsequivalent vectorsequivalent weightsequivalentlyequivocalerasableeraserergergodicergodic chainsergodic markov chainergodic sourceergodic theoryergonomyerlangenerlangen distributionerlangen programerlanger programerogodicerraticerroneouserrorerror analysiserror and trialerror bounderror detectingerror due to measurementerror extrema