Down arrow notation is an inverse of the Knuth up-arrow notation defined by e↓n | = | ln n e↓↓n | = | ln^* n e↓↓↓n | = | ln^** n, where ln^* n is the number of times the natural logarithm must be iterated to obtain a value <=e.
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Jonathan is doing really well in all of his classes this semester, 5 A’s & 2 B’s (he has a computer essentials class instead of PLC). In his Algebra class that Nathan is helping him with he has an A+.
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