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In CSE, we can use TeX. This makes it possible to do a number of things in comments, like (approximately by increasing questionableness) using “$k=\log_2(N)$” to insert a simple formula using “$\;$” to insert a wide space using “$$k=\sum_{j=0}^{j^2<n}2^j\cdot\log j$$” to insert a formula alone ...