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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"
Aug
16
comment If $3x^2 -2x+7=0$ then $(x-\frac{1}{3})^2 =$?
As is, the first step is not math, it is "magic". There is a "why" missing there.
Jun
20
comment Which of the numbers $1, 2^{1/2}, 3^{1/3}, 4^{1/4}, 5^{1/5}, 6^{1/6} , 7^{1/7}$ is largest, and how to find out without calculator?
+1 just adding that "raising both sides to the sixth power" is not a magical choice, instead it is the lowest common denominator for 2 and 3, thus turning the fractional exponents (hard to compute mentally) into integer exponents (easy or not-so-hard to compute)
Jun
7
comment Is there any intuitive way to think about the gamma function?
@columbus8myhw (and half of the world) please add some relevant text to your links (i.e., not "see this", "this page") Can you see why Zev Chonoles's links are much more useful than yours?
May
4
comment Result of solving an unsolved problem?
why? no need, and not the place, for a in-depth analysis, but a sketch of why it is important would be interesting.
Dec
25
comment Function whose third derivative is itself.
explaining what have the r's to do with the f's would help
Dec
17
awarded  Caucus
Nov
1
comment Why are there letters as additional digits in bases greater than the decimal base (10)?
I like this one a lot, but it probably has the problem that being understandable only by those that already know the answer (i.e., it is excelent reading to consolidate the knowledge, not to get it in the first place)
Oct
11
comment Am I just not smart enough?
If the scores are up to 100, and the average is 105, it must be some weighted average, right? Can't be the arithmetic mean - which usually is the average (So wouldn't be better calling it a 'grade', or something, then?)
Oct
10
comment Am I just not smart enough?
So, 105/100 in pre-algebra? («pre-algebra in which I got a 105 average»)
Oct
8
comment Am I just not smart enough?
I can understand the point, yet the details are mostly incomprehensible for non-US(?) readers. "a 36 average" of what, what is the maximum? 200? Again "4.0 GPA", GPA? and is 4.0 good or bad?
Jun
10
comment Highest average value when rolling dices
How do you join two successive sets of 4 dice? That is, if in a second set of 4 dice (5th to 8th roll) you get the same sequence as in your example (5x1, 5x1, x2, x4; totalling 400) what is the current score? You add both sets and get 800 (400+400) Or you keep on adding and multiplying totalling 3600? (400+50=450; 450x2=900; 900x4=3600)
Apr
26
comment How can I write the numbers 5 and 7 as some sequence of operations on three 9s?
Not everybody is using Windows... (and probably even needs a specific version of it)
Apr
25
awarded  Commentator