Question: Set notation.Use the filter and / or map notations to concisely express the following sets ( a ) The set of all composite natural numbers.

Set notation.Use the filter and/or map notations to concisely
express the following sets
(a) The set of all composite natural numbers. {0,4,6,8,9,10,12,14,15,16,18,20,...}.
(b) The set of all straight lines in the Cartesian plane. (Con-
sider a straight line to be a suitable subset of R \times R.)

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