Laws as definitions Some laws are correct purely by mathematical definition -LRB- e.g. , PERSON@1 's Second law -RRB- , or uncertainty principle , or least action principle , or causality .

The principle of least action -LRB- or principle of stationary action -RRB- , PERSON@2 equation , PERSON@3 uncertainty principle , causality and a few other laws also fall into this category -LRB- of mathematical definitions -RRB- .
