Definition of mass function in English:

mass function

noun ˈmas ˌfʌŋ(k)ʃn

Astronomy Mathematics

1Chiefly Astronomy. A function involving relationships of mass; specifically (a) a relationship used to determine the masses of the two stars of a spectroscopic binary when only the spectrum of one star (m₁) can be observed, namely (m₂ 3 sin3 i)/(m₁ + m₂)2, where m₁ and m₂ are the star masses and i is the inclination of the orbit; (b) an expression describing the number of objects per unit volume in different ranges of mass, for a group of stars, galaxies, etc.
2Mathematics. In full "probability mass function". A function giving the probability that a discrete random variable will take a specific value.

Origin

1920s. From mass + function.

Definition of mass function in US English:

mass function

nounˈmas ˌfʌŋ(k)ʃn

Astronomy Mathematics

1Chiefly Astronomy. A function involving relationships of mass; specifically (a) a relationship used to determine the masses of the two stars of a spectroscopic binary when only the spectrum of one star (m₁) can be observed, namely (m₂ 3 sin3 i)/(m₁ + m₂)2, where m₁ and m₂ are the star masses and i is the inclination of the orbit; (b) an expression describing the number of objects per unit volume in different ranges of mass, for a group of stars, galaxies, etc.
2Mathematics. In full "probability mass function". A function giving the probability that a discrete random variable will take a specific value.

Origin

1920s. From mass + function.

词汇	mass function
释义	Definition of mass function in English: mass function noun ˈmas ˌfʌŋ(k)ʃn Astronomy Mathematics 1Chiefly Astronomy. A function involving relationships of mass; specifically (a) a relationship used to determine the masses of the two stars of a spectroscopic binary when only the spectrum of one star (m₁) can be observed, namely (m₂ 3 sin3 i)/(m₁ + m₂)2, where m₁ and m₂ are the star masses and i is the inclination of the orbit; (b) an expression describing the number of objects per unit volume in different ranges of mass, for a group of stars, galaxies, etc. 2Mathematics. In full "probability mass function". A function giving the probability that a discrete random variable will take a specific value. Origin 1920s. From mass + function. Definition of mass function in US English: mass function nounˈmas ˌfʌŋ(k)ʃn Astronomy Mathematics 1Chiefly Astronomy. A function involving relationships of mass; specifically (a) a relationship used to determine the masses of the two stars of a spectroscopic binary when only the spectrum of one star (m₁) can be observed, namely (m₂ 3 sin3 i)/(m₁ + m₂)2, where m₁ and m₂ are the star masses and i is the inclination of the orbit; (b) an expression describing the number of objects per unit volume in different ranges of mass, for a group of stars, galaxies, etc. 2Mathematics. In full "probability mass function". A function giving the probability that a discrete random variable will take a specific value. Origin 1920s. From mass + function.
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