3,347 reputation
21034
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location Buenos Aires, Argentina
age 21
visits member for 4 years, 2 months
seen 8 hours ago

(my about me is currently blank)


Jul
20
comment Find all solutions, other than $2$ for $12x^3-23x^2-3x+2=0$
@Austin: You don't need to ask. You could just plug in those values and check whether they satisfy your equation.
Jul
19
comment Help solving differential equation: $y' = x\sqrt{4+y^{2}}/{y(9+x^{2})}$
The right side of the equality can be written as $\frac{\sqrt{4+y^2}}{y} \frac{x}{(9+x^2)}$. Does this help?
Jul
16
accepted Motivation for definition of logarithm in Feynman's Lectures on Physics
Jul
15
comment Motivation for definition of logarithm in Feynman's Lectures on Physics
I get it now, thank you! This paragraph is really weird, considering that the rest of the lectures is very well written and clear.
Jul
15
comment Motivation for definition of logarithm in Feynman's Lectures on Physics
@joriki: That really helps. Thanks!
Jul
15
asked Motivation for definition of logarithm in Feynman's Lectures on Physics
Jul
15
comment Is the function $y=\ln x^2$ the same as $y=2\ln |x|$?
Short answer: yes.
Jul
14
revised Problems regarding exponents
Not smart to use the same letters as in the assignments
Jul
14
comment Problems regarding exponents
@Rick: Yeah, I think I'll change it. Thanks for the advice!
Jul
14
answered Problems regarding exponents
Jul
7
comment I have to show $(1+\frac1n)^n$ is monotonically increasing sequence
Unless I'm missing something, that sequence is increasing, not decreasing.
Jul
1
accepted Does this weird sequence have a limit?
Jun
30
comment Does this weird sequence have a limit?
That's interesting. Does this change if instead of picking a number from ${1,2,3,4,5,6}$ we choose a random real number, or maybe one from the interval $[0,1]$?
Jun
30
comment Does this weird sequence have a limit?
@anon: Making a needlessly complicated definition was sort of the point. Also, you don't necessarily have to choose $k$ randomly. You can start from $1$ and work your way up if you want; the point is not so much in what order the terms are calculated, but that you can calculate $a_k$ for any $k$ you want.
Jun
30
comment Does this weird sequence have a limit?
@AndréNicolas: What I mean if that $a_k$ has already been calculated, there is no need to roll the die again. We just look at the list and check what was the value of $a_k$.
Jun
30
asked Does this weird sequence have a limit?
Jun
24
awarded  Nice Question
Jun
23
revised Expanding out summation signs
transformed image into latex, hope I read it right
Jun
23
suggested approved edit on Expanding out summation signs
Jun
23
comment If a function has a finite limit at infinity, does that imply its derivative goes to zero?
Also, a nitpick: shouldn't it be $x > 0$ instead of $x \ge 0$?