crf
Reputation
2,573
Top tag
Next privilege 3,000 Rep.
 Aug10 awarded Popular Question Jul2 awarded Curious Jul2 awarded Inquisitive Jun26 asked Sampling from a graph Jun26 revised how to solve $\sqrt{x^2 -2x} -x =0$? changed to latex Jun18 comment Contraposition and law of excluded middle @Materialist as far as I know (I am not an expert), the law of the excluded middle is formally equivalent to negation elimination. If we can obtain a statement without using negation elimination (i.e. without invoking $\neg\neg P \iff P$), we have proven it without making use of the law of the excluded middle. Here, we begin with, say, $(A\to B) \& \neg B$. If we can now show $\neg A$, then we've shown that $(A\to B)\to (B\to A)$. Now, assume $A$; we show that this leads to $B\&\neg B$, which allows us to conclude $\neg A$ without making use of the law of the excluded middle. Jun18 revised Relationship between Binomial and Bernoulli? edited tags Jun18 answered Relationship between Binomial and Bernoulli? Jun18 answered Contraposition and law of excluded middle Jun18 comment Extended Monte Hall problem (Hallway) We start with $n$ doors, and each door has $n$ doors behind it? The answer will be the same—you're not really changing the problem very much; you're just jiggling some parameters around a little bit. Now not switching wins when you select the right door and then select the right door, which happens with probability $1/n^2$. Switching wins when you select the wrong door, change to the right door, and then select the right second door, which happens with probability $\frac{(n-1)}{n}\times\frac{1}{n-1}\times\frac{1}{n}>1/n^2$. Have I interpreted your question correctly? Jun12 awarded Announcer Jun6 revised On prime(less)ness and composite(less)ness of 1 added 542 characters in body Jun6 answered On prime(less)ness and composite(less)ness of 1 Jun2 reviewed Approve combination GRE problem 25 Jun2 comment What does “radical cube zero” mean? For what it's worth, in mathematics, a "dimension" is not something that one can "enter". The dimension of a (vector) space is (roughly) the number of coordinates that it takes to fully specify a point in that space. So whatever references you've found to radical cubes (and I don't know what a radical cube is), it is doubtful that it has anything to do with entering or exiting other dimensions. Jun2 comment solve the equation for x Hello, I've changed your statement of the problem to LaTeX code, which I would recommend learning to get the most out of this site. Can you check to make sure that I've translated correctly? Jun2 revised solve the equation for x added latex May28 awarded Popular Question Apr16 revised How do you evaluate $f(x_n)$? added 87 characters in body Apr16 revised How do you evaluate $f(x_n)$? edited body