# User talk:Ancheta Wis/Archive

In mathematics, the Schläfli symbol is a simple notation that gives a summary of some important properties of a particular regular polytope.

It is defined as follows. The Schläfli symbol of a polygon with ${\displaystyle n}$ edges is ${\displaystyle \left\{n\right\}}$. The Schläfli symbol of a polyhedron is ${\displaystyle \left\{p,q\right\}}$ if its faces are ${\displaystyle p}$-gons, and each vertex is surrounded by ${\displaystyle q}$ faces. Note that the Schläfli symbol is not well defined for polyhedra which are not (sufficiently) regular (such as the prism).

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The Schläfli symbol also is a way of characterizing a random google search.

The Schläfli symbols of the platonic solids are:

• for the tetrahedron : ${\displaystyle \left\{3,3\right\}}$
• for the octahedron : ${\displaystyle \left\{4,3\right\}}$
• for the octahedron : ${\displaystyle \left\{3,4\right\}}$
• for the dodecahedron : ${\displaystyle \left\{5,3\right\}}$
• for the icosahedron : ${\displaystyle \left\{3,5\right\}}$

Schläfli symbols may also be defined for regular tessellations of euclidian or hyperbolic space in a similar way. the fourth dimentional view if we consider those then we have: For higher dimensional polytopes, the Schläfli symbol is defined recursively as ${\displaystyle \left\{p_{1},p_{2},\dots ,p_{n-1}\right\}}$ if the facets have Schläfli symbol ${\displaystyle \left\{p_{1},p_{2},\dots ,p_{n-2}\right\}}$ and the vertex figures have Schläfli symbol ${\displaystyle \left\{p_{2},p_{3},\dots ,p_{n-1}\right\}}$.

The Schläfli symbol is named after the 19th century mathematician Ludwig Schläfli who made important contributions in geometry and other areas.

${\displaystyle F_{r}=\sum _{k=0}^{N_{0}-1}f_{k}\exp(i\,r\Omega _{0}k)}$

where ${\displaystyle \Omega _{0}=2\pi {N_{0}}^{-1}}$.

what is this?

${\displaystyle (\mu -a_{1})\left\{{\frac {(\mu -a_{2})\cdots (\mu -a_{n})}{\mu ^{n-1}}}-1\right\},}$

${\displaystyle \int _{a_{k'_{\varrho }}^{A}}^{\alpha _{\varrho }}x\,dx}$

## Mount Tambora

See User_talk:Maveric149#Mount_Tambora. --mav 13:36, 7 Mar 2004 (UTC)

## My evil plan in action :)

Yay! I see you have updated at least one article in order to qualify an event for listing on a selected anniversaries page. [1] You might be interested in what I had to say on the top of Wikipedia talk:WikiProject Days of the Year concerning updates in general though. Happy hacking! :) --mav 04:28, 8 Mar 2004 (UTC)

I don't get the point of the link of Rubin in the Einasto profile. If they are both said to have worked in the same area (dark matter), shouldn't that link be in dark matter? I don't see anywhere else biographical pieces where there are explicit but uncommented links to other people who also deal with one of the areas of the person in question. Clossius 16:51, 18 Mar 2004 (UTC)

Ancheta Wis 20:40, 18 Mar 2004 replied:

Vera Rubin discovered evidence for 'dark matter' decades ago
I was reacting to the 'Did you know' notation which incorrectly attributed the discovery of dark matter only to Einasto, when Vera Rubin did the work decades ago in the midst of great incredulity. It is just to share credit with Einasto, but it is incorrect for the 'Did you know' notation to grant entire credit when she and Fritz Zwicky blazed the trail decades ago. But because I didn't want to mess up 'Did You Know' with a small detail, which, after all is designed to entice new people into Wikipedia, I reasoned that a curious person could just click on Einasto, as you did. So my scheme worked. And Einasto would be happy to share the credit with a giant, which Vera Rubin indeed is. It is again unjust that such a quiet scientist like Rubin would be ignored, in this age of women's rights. Notice again the inadequate article on Zwicky.
Her work on galactic rotation was not attributed either in that article or in the dark matter article, so where do we start ... I chose to start with a glaring injustice in Did You Know.

I assumed that you meant that, but the entry never credited Einasto exclusively, but rather said that he was "one of the" discoverers (and also many decades ago, of course). So, I guess it couldn't be clearer that there were others as well. (Actually, the sentence was misphrased, and I corrected it now: it read "and one of the discoverers of Dark Matter of the cellular structure of the Universe", whereas it should have said - and says now because I corrected it - "and one of the discoverers of Dark Matter and of the cellular structure of the Universe." I checked the link simply because I wrote the Einasto entry. I think contibutors to one discovery who worked independent from each other should be listed on the subject matter page. If anyone's is missing there, it can easily be put in. Clossius 21:37, 18 Mar 2004 (UTC)

## Sel anniv

Please make sure selected anniversaries are updated to reflect the event. For example, there is no mention or link to August 1 at Oxygen. If you were already planning on updating these articles then please disregard this note. --mav 00:28, 21 Mar 2004 (UTC)

I see you like Logarithmic timeline :) Kenny sh 12:07, 16 May 2004 (UTC)

## Laguna copperplate inscription

Hi Ancheta Wis. Would you mind if I moved the Copperplate details in the Chalcolithic entry to their own page? From my admittedly brief research I don't think the the Philipines had a Copper Age and went straight from the Neolithic to a short Bronze Age around 400BC. The presence of writing on plates from 900AD doesn't seem to fit in with this and puts the plates in the Filipino Iron Age. adamsan 17:07, 20 May 2004 (UTC)

## Roman chamomile in Yosemite Valley

Hello, Ancheta Wis. I've looked in a few references and cannot find supporting evidence for Roman chamomile (Chamaemelum nobile syn. Anthemis nobilis) in Yosemite Valley. What reference are you using? An interesting one is a 1907 catalog of botanicals in Yosemite, available at [2]. The closest species I could find there was Dog Fennel, aka Mayweed or Stinking Chamomile (Anthemis cotula), perhaps that is what you meant? If so, that's an invasive weed from Europe, with distribution across all of the USA. Not sure it's appropriate to list. -- hike395 05:21, 23 May 2004 (UTC)

Harry Potter   Albus Dumbledore
|                  |      |
|                  |      |
|   .--------------'      |
|   |                     V
|   |         Hogwarts teachers ---> Harry Potter characters ---> Harry Potter
V   V                                ^   |                            |
Gryffindors-----------------------------'   |                            V
V                   Fictional universes
Fictional characters                   |
|                            V
'--------------------->  Fiction