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visits member for 3 years, 3 months
seen Jan 28 at 18:23

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 suggested 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