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Nov
1
revised measurable functions. Why defined like this?
edited body
Nov
1
answered measurable functions. Why defined like this?
Oct
31
revised What mathematical object accepts a sequence as input?
added 113 characters in body
Oct
31
answered What mathematical object accepts a sequence as input?
Oct
31
comment Is there a more concise way to indicate many elements that belong to a set?
@MartinBalog: (1) No, if $(a,b,\ldots,l)\in A\times B\times\ldots\times L$ then $a\in A$, $b\in B$, …, $l\in L$.
Oct
31
comment My proof is correct ? (Topology)
What is $\mathcal V_x$?
Oct
31
answered boolean equation to truth table
Oct
31
comment $\mathbb{R}$ is a countable union of closed sets, then at least one of them has nonempty interior
In the "related" section, this turns up: math.stackexchange.com/questions/88632/… — I guess that should be helpful.
Oct
31
revised boolean equation to truth table
MathJax, typos
Oct
31
comment boolean equation to truth table
Ah, so the "output of the truth table" is the column giving the truth values of the expression? In that case, how did you sort the rows? Is it "FFF,FFT,FTF,…" or "FFF,TFF,FTF,…"?
Oct
31
comment boolean equation to truth table
What is the output of a truth table?
Oct
29
comment Is zero a prime number?
Why do you refer to zero as "he"?
Oct
29
comment Where, if ever, does the decimal representation of $\pi$ repeat its initial segment?
@MarcPaul: Indeed, a number can even infinitely often repeat itself without being rational. Consider $0.10100101000101001010000101001010001010010100000\ldots$. It repeats itself after the second digit ($0.10\color{red}{10}\ldots$), after the fifth digit ($0.10100\color{red}{10100}\ldots$), after the 11th digit ($10100101000\color{red}{10100101000}\ldots$), …
Oct
28
answered convergent sequence / prove of reordering rule
Oct
28
revised convergent sequence / prove of reordering rule
added 3 characters in body
Oct
28
comment Is there any closed form solution for a function $f$ on $\mathbb R$ satisfying $f(t+s)=f(t)f(s)$
The constant $1$ is also an exponential function: $1 = \exp(0x)$.
Oct
27
comment The law of the unconscious statistician
Maybe it's because if you're unconscious, you don't have any expectations (in the usual, psychological sense).
Oct
26
comment Relatively tight upper and lower bounds for surreal numbers
Great, thank you. Of course when you say "of unbounded birthdates" you mean "unbounded in $\mathbb N$", as all birth dates of dyadic fractions are bounded by $\omega$.
Oct
26
awarded  Generalist
Oct
25
comment Another way of counting probability
@paw88789: See edited answer.