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Aug
22
suggested approved edit on Make $n$ cents with $1$-cent, $2$-cent, and $3$-cent coins
Aug
22
answered Make $n$ cents with $1$-cent, $2$-cent, and $3$-cent coins
Aug
22
comment Make $n$ cents with $1$-cent, $2$-cent, and $3$-cent coins
@Ragnar That gives a generalized Tribonacci sequence, which is much more than $\sim n^3/12$.
Aug
22
comment Make $n$ cents with $1$-cent, $2$-cent, and $3$-cent coins
Well, then the answer can't be correct since even with only 1c and 2c coins, there are $f_n$ (Fibonacci number) solutions; that's exponential, not polynomial.
Aug
22
comment Make $n$ cents with $1$-cent, $2$-cent, and $3$-cent coins
Are $5=1+2+2=2+1+2=2+2+1$ three different solutions? It seems not, but I'm not sure
Aug
17
comment Is there an interval notation for complex numbers?
@Teepeemm It's not interval arithmetics, it's simply set arithmetics with addition and multiplication, and you can do this over any ring, right?
Aug
17
comment Is there an interval notation for complex numbers?
@JimmyK4542 It is common to define $X+Y = \{x+y:x\in X, y\in Y\}$ IMHO. There's no need to introduce an extra symbol for that.
Aug
17
comment Is there an interval notation for complex numbers?
+1 This just shows that defining a complex interval to be a rectangle doesn't sound like a great idea...
Aug
17
comment Is there an interval notation for complex numbers?
@GEdgar Better one: Do not introduce notation unless you are 111% sure you need it and it makes your paper easier to follow.
Aug
10
revised What is remainder when $5^6 - 3^6$ is divided by $2^3$ (method)
improved formatting
Aug
10
suggested approved edit on What is remainder when $5^6 - 3^6$ is divided by $2^3$ (method)
Aug
8
comment What is the oldest open problem in geometry?
@DavidH Sorry, the margin I mean the comment area is too small to catch all of that :D
Aug
8
comment What is the oldest open problem in geometry?
@littleO This problem is as old as the humankind. First, we thought that the earth is flat. Then we realized that it's not flat, then we forgot this and neglected it, then we found out it's true. Then we thought that the whole space is flat (i.e., $\simeq\mathbb R^3$), only to realize that this is not true either.
Aug
1
revised Produce unique number given two integers
added 130 characters in body
Aug
1
answered Produce unique number given two integers
Jun
13
comment Proof of irrationality of a series
+1 very nice, simple, straighforward yet not trivial argument :)
Jun
5
comment Prove $\sqrt6$ is irrational
sorry, corrected. And well, I say that I use stronger weapons, which can be used in a large framework, I know that simpler solutions exist.
Jun
5
revised Prove $\sqrt6$ is irrational
added 2 characters in body
Jun
3
answered What is a Parabolic Fixed Point?
Jun
3
answered Prove $\sqrt6$ is irrational