# Notation for zero matrix

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There is no universal standard notation for zero matrices or zero vectors. You are presumably asking within the context of a paper, book, or class --- you should figure out or ask about the convention used within this context.

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### jmodest

Updated on September 22, 2022

I'm confused by notation for matrices. Does $0_n$ mean a zero matrix of size nXn or a zero vector of size nX1 ?