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Mathematics
Xander Henderson's user avatar
Xander Henderson's user avatar
Xander Henderson's user avatar
Xander Henderson
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  • Member for 6 years, 11 months
  • Last seen this week
  • Holbrook, AZ, USA
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I am faculty in mathematics at Northland Pioneer College in beautiful Navajo County, Arizona.

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View all questions and answers
90
Can area of rectangle be greater than the square of its diagonal?
Nov 15, 2018
75
Why do we need so many trigonometric definitions?
Mar 29, 2018
53
"Gaps" or "holes" in rational number system
Apr 29, 2020
42
Why do I get a converging result when pressing cosine multiple times on a calculator?
Oct 11, 2017
31
What is the name of the number that is being added to another number?
May 20, 2018
31
A curiosity: how do we prove $\mathbb{R}$ is closed under addition and multiplication?
Dec 12, 2018
25
What's the precise meaning of the expression "induced by" in mathematics?
Mar 23, 2018
25
Why is a derivative defined using limits?
Jun 27, 2018
23
Getting different answers when integrating using different techniques
Nov 27, 2019
23
Let $A\subset\mathbb{R}$ be an uncountable set of irrational numbers. Does there exist a finite $B\subset A$ such that $\sum_{x\in B} x\in\mathbb{Q}?$
Jan 1
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Enforcement of Quality Standards
61
Why image cannot be used for explaining my maths problem?
55
Do we want accepted answers unpinned on Math.SE?
52
2020 Election Results: Congratulations to our new moderator!
44
Moderation Strike Resolution
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67
What's a replacement for "married couples" in combinatorics problems?
56
Plagiarism or just cheating?
47
In the U.S., is it appropriate for math professors to ask students to rewrite their messy (poorly handwritten) homework to be graded?
41
Is it a good thing as a teacher to declare things like "Good! Things are becoming clearer already."
36
What should you do when asked by the chair to raise course grade distribution when the students do not deserve it?