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2d
comment why $\frac{t + t^2}{(1 + t)^2} \sim t + t^2$?
To make sense of the question, you should add something like $t \to 0$ or $t \to \infty$ or $t \to 17$.
Jul
25
comment Why is $f(x) = x^2$ uniformly continuous on [0,1] but not $\mathbb{R}$
Other posters are claiming it is not uniformly continuous on other domains, such at $\mathbb R$.
Jul
24
comment Are random variables independent of their tail sigma-algebra?
A fine example of an "exchangeable" sequence that is not "independent".
Jul
24
asked Successive divisibility of a sequence? Progressive divisibility? terminology or reference
Jul
22
revised Is the golden ratio overrated?
added 14 characters in body
Jul
22
comment Proper integration procedure
I did not downvote, but maybe somebody thought you did not answer the question: "is this the proper procedure?"
Jul
22
revised Is the golden ratio overrated?
added 23 characters in body
Jul
21
comment Volume of Tetrahedron
Can you find a relation between the volume of the first tetrahedron, and the added tetrahedra?
Jul
20
comment Function that looks a lot like exponential, but isn't
I wonder if the OP still says this isn't an exponential.
Jul
20
comment Order topology on a poset
I guess an "open ray" is a set of the form $(a,\to) = \{x \in X : x>a\}$ or dually? What conditions do you need to check to see whether a collection of sets is a subbase for a topology?
Jul
20
comment About the convexity of $\sin x$ for $\pi\leq x\leq 2\pi$
I suppose you need to fiddle around with addition formulas for $\sin$. But first tell us why you avoid the easy method, and try to find a hard method.
Jul
20
comment Omitting parantheses in formulas
Parentheses in logic formulas can become very numerous. Some older logic texts set up a system of dots to use in place of parentheses.
Jul
20
comment Omitting parantheses in formulas
Note the questions here confusing $-(x^2)$ with $(-x)^2$ when $-x^2$ is written. Of course in this case, only beginners make the mistake.
Jul
19
comment Closed form for this sum?
One method. Compute many decimals, then put them in ISC to see if they are recognized. isc.carma.newcastle.edu.au
Jul
18
comment Derivative Of $\ln(x)$
And you do know about $c^b$ where $b$ is irrational?
Jul
18
comment Derivative Of $\ln(x)$
Can you use $\ln x = \int_1^x \frac{ds}{s}$ ?? If not, what is your definition of $\ln$??
Jul
17
comment Most natural intro to Complex Numbers
Another sophisticated approach is to realize $\mathbb C$ as a subset of the $2 \times 2$ matrices.
Jul
17
comment Why (or when) is the direct limit of compact spaces paracompact?
What does Whitehead say?
Jul
17
comment Most natural intro to Complex Numbers
Good answer. But I wonder if someone is "very skeptical", would he accept the real numbers?
Jul
17
comment Proof of Lindelöf Theorem
Repeating what bof said: the Lindelof theorem in complex analysis (which has proofs involving complex analysis) is not the same theorem as the Lindelof theorem quoted by the OP.