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Mass function may refer to:

• Binary mass function, a function that gives the minimum mass of a star or planet in a spectroscopic binary system
• Halo mass function, a function that describes the mass distribution of dark matter halos
• Initial mass function, a function that describes the distribution of star masses when they initially form, before evolution
• Probability mass function, a function that gives the probability that a discrete random variable is exactly equal to some value

• Disambiguation pages