I finally figured out how to use KaTex last night and posted a something on the gradient of logistic regression to test things out. So now I’ve decided to maintain this list of mathematical words/jargons that I come across quite frequently in my field and everytime have to check wikipedia to refresh my memory. I hope this will make it easier for me to remember them.

**Subadditive:**
A subadditive function is a function , having a domain A and an ordered codomain B that are both closed under addition, with the following property,

**Submodular:**
Let be a finite ground set and . Then is submodular if ,

**Hamming Distance:**
In information theory, the Hamming distance between two strings of equal length is the number of positions at which the corresponding symbols are different

**Log Determinant of SPD Matrix**
Usually in computation packages the determinant of the covariance matrix throws **NaNs** . But it turns out that **log** of the determinant might still be finite. Therefore,

`L = tf.tf.cholesky(cov)`

`log_det_cov = 2*reduce_sum(tf.log(tf.matrix_diag(L)))`