3,644 reputation
1934
bio website blueraja.com/blog
location
age
visits member for 4 years, 3 months
seen Oct 22 at 23:34

Sep
30
awarded  Explainer
Aug
22
awarded  Notable Question
Jul
21
awarded  Yearling
Jul
2
awarded  Curious
May
13
revised Why can't you add apples and oranges, but you can multiply and divide them?
deleted 1 character in body
Mar
24
awarded  Notable Question
Feb
12
answered The result of O(f(n)) - O(f(n))
Feb
3
comment Is it faster to count to the infinite going one by one or two by two?
but proving that the (euclidean) common notion that "a proper part is less than the entire" will not hold for infinite set. - That actually depends on how you define "less than"...
Jan
31
revised In a family with two children, what are the chances, if one of the children is a girl, that both children are girls?
deleted 7 characters in body
Dec
12
revised How to calculate $(a+b)(c+d)$
wrong letter
Dec
2
comment How to prove that $P \neq NP$
@user43400 Everything this poster has said here is correct. Perhaps you are confused by his "proof by contradiction," which makes the $P = NP$ problem appear to be deceptively simple? The difficult part is step 3: "Prove R cannot be solved in polynomial time (deterministically)". That's the part that no one's been able to do.
Nov
27
comment Do Symmetric problems have Symmetric solutions?
By that logic, you could say the problem is also non-symmetric because $x^4-2x^2$ is not symmetric about the x-axis. You can't just point out one way in which the solution is non-symmetric and conclude "therefore the whole thing has no symmetry"
Nov
27
comment Do Symmetric problems have Symmetric solutions?
I don't see how that statement is meaningful or relevant. The statement "The problem has symmetry but the solutions don't" is false, so though I'm sure there are valid counter-examples, this is not one of them.
Nov
26
comment Do Symmetric problems have Symmetric solutions?
$x=1$ and $x=-1$ are symmetric about the y-axis as well...
Nov
25
awarded  Custodian
Nov
25
reviewed No Action Needed Generating set for factor group
Nov
25
reviewed No Action Needed How to find the sum of subsequences and sum of the series for series like these?
Nov
25
reviewed No Action Needed What is the best way to define the diameter of the empty subset of a metric space?
Nov
25
reviewed No Action Needed Ruin time for a two-input “risk only” slot machine
Nov
25
reviewed Close Recovering ring information from localizations