1. w.r.t. ------- with respect to 常用于求导,或者满足一定条件之类的情况 2. s.t. ------- subject to 约束于 / such that 使得 3. r.v. ------- random variable 随机变量 4. iff ------- if and only if 当且仅当 5. i.i.d. ------- independently and identically distributed 独立同分 6.x* = arg min ...