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Useful mathematical symbols

The following table shows mathematical symbols with their meaning:

Symbol	Meaning	Symbol	Meaning
≡	Is defined as	≤	Less than or equal to
=	Is equal to		Sigma, World state
≠	Is not equal to		Mu, Machine state
║...║	Length of		Upsilon, Ethereum state transition function
	Is an element of		Block level state transition function
	Is not an element of	.

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