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I am not too understanding this equation. Do any one know it? Especially what is m stand for since I cannot get it from the paper.

Thanks

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From the paper (section 4.4, page 5):

mixHash: A 256-bit hash which proves combined with the nonce that a sufficient amount of computation has been carried out on this block; formally Hm.

See entry (160) in the paper for a complete description of the Proof of Work algorithm, and how the nonce, entry (49), is used.

The step-by-step explanation of the Ethash (i.e. PoW) algorithm on the wiki will also be of help: https://github.com/ethereum/wiki/wiki/Ethash

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