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graydad

Member for 8 years, 10 months
Last seen more than a month ago

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calculus

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Answers

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34

What's wrong with l'Hopital's rule?

May 17, 2015

29

What is an example of function $f: \Bbb{N} \to \Bbb{Z}$ that is a bijection?

Oct 9, 2014

19

Why/How does this sqrt term work? The inverse of a fraction in a sqrt

Mar 25, 2015

17

Easy math proofs or visual examples to make high school students enthusiastic about math

Jun 24, 2015

13

Proof: The identity matrix is invertible and the inverse of the identity is the identity

Feb 23, 2015

Questions

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8

Mary Ellen Rudin's proof that all metric space are paracompact

Sep 3, 2014

6

Prove that $\mathbb{R}^{n}-A$ with the standard topology is connected where $n \geq 2$ and $A \subset \mathbb{R}^{n}$ is countable.

Jul 31, 2014

4

Uniqueness of radix representation of integers in base 3

Jan 5, 2015

3

Show that two different representations to the base $k$ represent two different integers

Jan 13, 2015

3

Exact value of $\sum_{n=1}^\infty \frac{1}{n(n+k)(n+l)}$ for $k \in \Bbb{N}-\{0\}$ and $l \in \Bbb{N}-\{0,k\}$

Nov 16, 2014

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calculus

215

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limits

109

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48

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algebra-precalculus

90

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43

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real-analysis

88

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61

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general-topology

82

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62

posts

Reputation

+10

An example of an infinite open cover of the interval (0,1) that has no finite subcover

+10

Prove that the finite union of separable sets is separable.

+10

How do I determine if a set is open or closed??

+10

$f(x)=x^{3}+1$ - Injective and Surjective?

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Oct 12, 2015
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Oct 22, 2014
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Oct 26, 2015

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Sep 15, 2015
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Mar 27, 2016
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Jun 15, 2015

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limits

Feb 2, 2018
calculus

Mar 14, 2015
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Oct 29, 2014

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