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 Jul 2 awarded Curious Mar 27 comment All natural numbers are equal. +1, very good explanation. The second case should be $b = k \cap 1 \le a \lt k$. Dec 22 awarded Yearling Oct 29 comment Gaussian Kernels, Why are they full rank? If $K$ is a kernel then it is positive definite without any additional assumptions. If for any distinct $x_1, ..., x_m$ functions $K(., x_1), ..., K(., x_m)$ are linearly independent, then kernel $K$ is strictly positive definite. The converse is also true. Oct 28 accepted A property of a non strictly positive matrix Oct 28 comment A property of a non strictly positive matrix (+1) Great answer, thank you. Just a little expansion. $x^t Q x \geq m > 0$ if and only if $Q$ is strictly positive definite. $x^t Q x \leq M < 0$ if and only if $Q$ is strictly negative definite. $m \leq 0 \leq M$ means that $Q$ is not strictly positive nor strictly negative definite. In this case it has been shown that there exists $c \neq 0$: $c^t Q c = 0$. Oct 28 revised A property of a non strictly positive matrix improved notation Oct 28 suggested approved edit on A property of a non strictly positive matrix Oct 28 asked A property of a non strictly positive matrix Nov 23 revised Biological processes described by the exponential function added 123 characters in body Nov 23 comment Biological processes described by the exponential function I'm still alive! Nov 23 asked Biological processes described by the exponential function Aug 2 comment Mathematical description of a random sample @Didier, yes, the answer that I posted is good enough for me. I hope it may be helpful for other people as well. Jul 31 awarded Editor Jul 31 revised Mathematical description of a random sample edited body Jul 31 answered Mathematical description of a random sample Jul 30 comment Mathematical description of a random sample And then I have $X(t_1), X(t_2), ..., X(t_n)$ where $t_i \in \{\omega_1, ..., \omega_6\}$ Jul 30 comment Mathematical description of a random sample $X: \{\omega_1, \omega_2, ..., \omega_6 \} \to \{1, 2, ..., 6\}$ Jul 30 comment Mathematical description of a random sample @Didier, consider this example: I throw a die 10 times to get a sample of 10 integer numbers. Why should I consider this as 1 and not 2? If I throw 10 dice simultaneously to get 10 numbers, then I'm OK to consider this as 1. Jul 30 awarded Promoter