Kai Nakazawa

Chapter 2.4.3: math_atan2 should be used for two-argument arctangent

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Code snippets in Chapter 2.4.3 call the `math_atan` function with two arguments `(y, x)`, which causes errors if the selectors in question are used. This should be changed to use...

Book error: Exercise 3.57 is incorrect, memoization of add_streams is insufficient

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I believe I have found an error in the book. ## The Error (Exercise 3.57) [Exercise 3.57](https://sourceacademy.org/sicpjs/3.5.2#ex-3.57) is defined as: > How many additions are performed when we compute the...