User:Wellset/sandbox

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$x = (y 2 + 2)$

Rich, T. C. G.; Jermy, A.C. (2012 reprint). Plant Crib. {{cite book}}: Check date values in: |date= (help)

Superellipse

A Superellipse has curvature 0 on its axes ( $x = 0, y = 0$ ) provided its exponent is greater than 2. Since the surface of a superegg is generated by rotating a superellipse (of exponent greater than 2) about an axis, the major and minor curvatures are necessarily also both zero on this axis. The requirement of stability for any object is that both radii of curvature shall be greater than the height of the centre of mass above the point of balance (or infinite) and is therefore satisfied in this case. It turns out that an ellipsoid always has exactly one stable axis, except in degenerate cases (prolate ellipsoid of revolution, sphere) when it has more. I'm not sure of the relevance of the Monkey saddle since that can't sit on a plane surface at all.

Twin Primes/Prime Pair

A twin prime is a prime number that differs from another prime number by two, for example the twin prime pair (41, 43). Sometimes the term twin prime is used for a pair of twin primes; an alternative name for this is prime twin or prime pair.

A twin prime is a prime number that differs from another prime number by two, for example either member of the prime pair (41, 43). An alternative name for this is prime twin.

Sometimes the term twin prime is used for the pair of twin primes, not just one or the other; an alternative name for this is prime twin or prime pair. T

User boxes

This user is interested in
Botany.

that or which?

This user is proud of being a trifle pedantic

I don't know how this {{userbox|cyan|lightblue|ex|<text>}} works: copied from User:BrownHairedGirl

that or which?

This user is proud of being a trifle pedantic

My version: much more tedious (from Template:Userbox sample compact, copied raw code)

UBX violation

User:Veryhuman/Userboxes/Wildflowers violates WP:UBX: Userboxes should not automatically include categories.

Thrips

See Chinery p140

BSBI Publications

The list of publications in BSBI is more or less limited to the Handbooks.

The Summerfield Catalog BSBI section has a more comprehensive list, and probably contains ISBN's for the handbooks as well.

Plant Crib (2012 reprint) T.C.G. Rich & A.C. Jermy ISBN 9780901158284
50 years of Mapping the British and Irish Flora 1962-2012 (2012) Michael Braithwaite and Kevin Walker ISBN 9780901158468

Flora

See also Flora (disambiguation) and Flora (publication). The latter duplicates much of the Flora article: which came first?

Dony, John George, Jury, SL & Perring, F (1986), English names of wild flowers 2nd edn. Botanical Society of the British Isles, Reading

Search for "English names of wild flowers" on Google Books for references.

The Flora article used to start with an explanation of the two meanings of the word Flora, but no longer. Now the reader has to read half way through the article before finding the "treatise" definition. Not Good.

List of Floras

The subtitles are generated by prefixing the line with (;). This violates H:DL:

Is H:DL now out of date?

The list is confused by the fact that eg under the Sub-subsection (====) Europe there is subtitle Great Britain, and the first 5 items belong to this, but subsequent titles do not. This is completely unclear to the reader.

Europe

British Isles

Morton, O.[[Osborne Morton|1994. Marine Algae of Northern Ireland. Ulster Museum, Belfast. ISBN 0-900761-28-8]]
Stace, Clive Anthony, and Hilli Thompson (illustrator). A New Flora of the British Isles. 3rd ed. Cambridge University Press, 2010. ISBN 978-0-521-70772-5.
Beesley, S. and J. Wilde. Urban Flora of Belfast. Belfast: Institute of Irish Studies, Queen's University of Belfast, 1997.
Killick, John, Roy Perry and Stan Woodell. Flora of Oxfordshire. Pisces Publications, 1998. ISBN 1-874357-07-2.
Bowen, Humphry. The Flora of Dorset. Pisces Publications, 2000. ISBN 1-874357-16-1.

Flora Celtica Plants and people in Celtic Europe
Flora Europaea at the site of The Royal Botanical Gardens of Edinburgh Flora Europaea
Flora of Europe
Flora iberica
Flora of Acores
Flora Danica
Flora of Romania
Flora of Catalonia

P555

In Wikipedia as USS S-24, redirect from HMS P555.

The page says she was returned to US Navy and sunk off Portland Oregon. All my references say she should have been returned but was in fact "intentionally destroyed" in Lyme Bay off Portland, Dorset, UK at 50° 30.87N 02° 33.68W. See eg:

Innes McCartney, Lost Patrols (P555)

Denominators of the Bernoulli Numbers

The von Staudt–Clausen theorem shows that the denominator D_2n of the Bernoulli number B_2n can be written

 $D_{2n}=\prod _{(p-1)|2n}p$

where p is prime.

Thus for 2n=20 the divisors of 2n are 1,2,4,5,10,20 and the only primes p such that p-1 belongs to this set are 2,3,5,11. Therefore D₂₀=2.3.5.11=330.