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Mar 1, 2020 at 22:58 comment added mr_e_man @Randal'Thor - The letter $O$ seems to be a common notation for the zero matrix (to distinguish from the zero vector, for example).
Feb 29, 2020 at 21:43 vote accept MightyPower
Feb 29, 2020 at 21:43 comment added MightyPower Thank you for the answer.
Feb 29, 2020 at 21:24 history answered Nathaniel Johnston CC BY-SA 4.0