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Apr
24
awarded  Custodian
Apr
24
reviewed Approve Easier way to divide a fraction by a fraction.
Apr
24
comment Easier way to divide a fraction by a fraction.
@zahbaz: I agree, one still needs to teach and practice and understand the why before, or along, with memorizing rules.
Apr
24
comment Easier way to divide a fraction by a fraction.
How can I make the first fraction's font a little larger? (or someone do it, please)
Apr
24
answered Easier way to divide a fraction by a fraction.
Apr
23
comment There does not exist any integer $m$ such that $3n^2+3n+7=m^3$
Thank you for adding that remark, explaining why try modulo 9. That is the main thing in a good reply (I think). Not the solution itself, but why go that way.
Apr
22
comment There does not exist any integer $m$ such that $3n^2+3n+7=m^3$
why? what hints the hint? (magic solutions are not useful)
Mar
26
comment Why does adding a term $5f'(t)$ to $5f''(t)+10f(t)=0$ cause damping?
I hope someone can make up a better title for this. "I understand the what, I want to know the why" may be colourful but describes little of the problem. Yet, I am with not much of an imagination either...
Mar
25
comment Is it really true that “if a function is discontinuous, automatically, it's not differentiable”?
+1: I think this is the only fully correct answer, as it addresses the general case. Showing that the example non-discontinuous function is not differentiable does not prove (not even in a weak way) that there must not be any differentiable non-continuous function
Feb
29
revised Bayesian inference exercise
a few a to $a$, more minor formatting
Feb
29
suggested approved edit on Bayesian inference exercise
Feb
14
awarded  Yearling
Feb
14
answered pdf is defined as $f_X(x)=P(X=x)$ but isn't $P(X=x)=0$
Jan
31
revised Random variable dependent on some factor
spell out 1 - add to symetric expression
Jan
31
asked Random variable dependent on some factor
Dec
31
comment Is it possible to draw this picture without lifting the pen?
I wouldn't call it that much "easy". The "bend at the centre" (path 8 to 9 on your image) can make it tricky, as probably the temptation is to follow the straight lines all the way through. Are there solutions that don't "bend on the center"? (I have not even tried, I admit)
Dec
12
comment Does “Doing a thing to both sides of an equation” have a name?
In Portuguese there is the word "algarismo", "numerical digit", also coming from Al-Khwarizmi (and it also has "algoritmo" and "algebra")
Sep
24
comment Is it possible to describe the Collatz function in one formula?
Simple and straight to the point. Excellent! Off course, there it is (-1)^n as the 'hidden modulo 2' that @MiloBrandt pointed. And the original expression is still much clearer, but this one is a great one liner
Aug
18
comment If $3x^2 -2x+7=0$ then $(x-\frac{1}{3})^2 =$?
@Harish yes. But I still think Burr's answer is clearer because it it is clearer that we are aiming to get to (x-1/3)^2
Aug
16
comment If $3x^2 -2x+7=0$ then $(x-\frac{1}{3})^2 =$?
I actually like the brute force approach for this one. Sometimes we need to get our hands "dirty"