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    Notation in probability and statistics - Wikipedia

    Probability theory and statistics have some commonly used conventions, in addition to standard mathematical notation and mathematical symbols. See more

    Random variables are usually written in upper case Roman letters: $${\textstyle X}$$, $${\textstyle Y}$$, etc.
    • Particular realizations of a random variable are written in corresponding lower case letters. For example, See more

    Matrices are usually denoted by boldface capital letters, e.g. $${\textstyle {\mathbf {A}}}$$.
    Column vectors are usually denoted by boldface lowercase … See more

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