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Non-measurable sets and the equation ๐‘“(๐‘ฅ+๐‘ฆ)=๐‘“(๐‘ฅ)+๐‘“(๐‘ฆ)

Non-measurable sets and the equation ๐‘“(๐‘ฅ+๐‘ฆ)=๐‘“(๐‘ฅ)+๐‘“(๐‘ฆ)

1. A set of S real numbers which has inner measure m*(S) different from its outer measure m*(S) is non-measurable. An extreme form, which we shall call saturated non-measurability, occurs when m*(S) = 0 but m*(SM) = m(M) for every measurable set M, m(M) denoting the measure of M. This โ€ฆ