This is a list of observations named after people (eponymous observations). For other lists of eponyms, see Eponym .
Benford's Law - ''In any collection of statistics, a given statistic has roughly a thirty percent chance of starting with the digit one.''
Boyle's Law - ''The pressure (P) and Volume (V) of an ideal gas of fixed mass and temperature is related by P x V = K, where K is a constant.'' Named after Robert Boyle .
Duverger's Law - ''Winner-take-all electoral systems tend to create a two party system, while proportional representation tends to create a multiple party system.'' Named after Maurice Duverger .
Grimm's Law - Explains correspondence between some consonants in Germanic languages vs. other Indo-European languages. Discovered by Jacob Grimm , one of the Brothers Grimm .
Hotelling's Law - ''Under some conditions, it is rational for competitors to make their products as nearly identical as possible.'' Named after Harold Hotelling .
Little's Law - ''The average number of customers in a stable system (over some time interval) is equal to their average arrival rate, multiplied by their average time in the system.'' The law was named for John Little .
Metcalfe's Law - In Network theory, ''the value of a system grows as approximately the square of the number of users of the system.'' Framed by Robert Metcalfe .
Reilly's Law - ''People generally patronize the largest mall in the area.''
Rock's Law - ''The cost of a semiconductor chip fabrication plant doubles every four years.'' Named after Arthur Rock .
Zipf's Law - ''For many different kinds of things, their frequency is observed to be approximately inversely proportional to their rank order.''. Named after George Kingsley Zipf .
Wilcox-McCandlish Law of Online Discourse Evolution - ''The chance of success of any attempt to change the topic or direction of a thread of discussion in a networked forum is directly proportional to the quality of the current content.''
