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| bio | website | blog.plover.com |
|---|---|---|
| location | Philadelphia, USA | |
| age | ||
| visits | member for | 1 year, 3 months |
| seen | 4 hours ago | |
| stats | profile views | 2,429 |
I am Mark Dominus, an amateur.
I have a blog that often carries articles about mathematics.
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3h |
comment |
Guides/tutorials to learn abstract algebra? answers on this site are supposed to be self-contained, but you haven't said what "this" is or why you think it will be a great help. |
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3h |
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What are some examples of subtle logical pitfalls? Descartes was anticipated here by St. Anselm. |
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11h |
awarded | Announcer |
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12h |
revised |
Why must we distinguish between rational and irrational numbers? edited body |
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17h |
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Manual proof that ${\left(\pi^\pi\right)}^{\pi^\pi}$ is a noninteger edited body |
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17h |
revised |
Manual proof that ${\left(\pi^\pi\right)}^{\pi^\pi}$ is a noninteger added 464 characters in body |
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17h |
comment |
Manual proof that ${\left(\pi^\pi\right)}^{\pi^\pi}$ is a noninteger Yes, it's quite straightforward to calculate a sufficiently precise value to show that it is a noninteger, but unless you have a version of Wolfram Alpha that runs on a slide rule, that's not what the question is about. |
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17h |
answered | $(x+2)\cos\frac1{x+2} - x\cos\frac1x > 2$ for $x\in[1,\infty)$ |
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17h |
revised |
$(x+2)\cos\frac1{x+2} - x\cos\frac1x > 2$ for $x\in[1,\infty)$ added 3 characters in body |
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18h |
comment |
quick integration notation question Some context would be very helpful here. What is the rest of the expression? |
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18h |
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How many ways to colour a tetrahedron with monochromatic triangles. I agree that it is highly abbreviated. I had to read carefully before I understood. Does it help if I explain that it's an application of the inclusion-exclusion formula, or should I provide more detail? |
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19h |
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Big Greeks and commutation Even when the elements commute, the order might be important if the index set is infinite. |
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19h |
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Big Greeks and commutation edited tags |
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19h |
revised |
Integration using summation deleted 8 characters in body |
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20h |
revised |
Solving simple system of congruences deleted 42 characters in body |
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21h |
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Prove that $f(f(x))=x$ has no roots … $f$ having a general form I think the way you have it now is perfectly clear. |
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21h |
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Prove that $f(f(x))=x$ has no roots … $f$ having a general form Why do you say must $f$ be strictly decreasing or strictly increasing? This is wrong, since $f' = 2ax+b$ which must cross the $x$-axis if $a\ne 0$. |
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1d |
answered | Quadratic Formula problem? |
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1d |
comment |
A Question about Doctoral Theses in Mathematics I have heard that Norbert Wiener's thesis did nothing but observe that ordered pairs can be construed as plain sets, and therefore that set theory is sufficient to define pairs. |
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1d |
answered | What is a “distinguished subset”? |
