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The other two are from 91.200.12.42 which is a known Ukrainian spam address. (Can someone more knowledgeable please check this out. It seems to be a bot / spider.) I will clear the two pages and send them to ‘empty’. (143 and 144)
The wp-login
pages are probably automatic attempts from a bot to gain access to our hypothetical WordPress installation.
I emptied a page F-theory - From11dSupergravity which seemed to be spammed. It is now empty 146.
Seems to be spam again, see latest revisions, probably from ’Computer Science’ up to ’mylab Classical dynamics books’.
Usually I delete and empty such entries, but in this case I was waiting to see if whoever had created the ‘mylab’ pages had some useful intent behind their attempt. What do others think? As David_C says, the entries start at Computer Science then mylab and so on, and at all from anon1 at 41.178.232.137, who is in Egypt it seems.
I think it’s spam. I never can quite remember what exactly we do. Is there a recipe we could write somewhere?
I will try to remember… although sometimes I get it wrong. :-(
A problem can arise if the page really was spamming something already written, so check the page did not have a History first. If it did exist prior to the Spamming, revert to the latest unspammed version. If not then you delete the contents, check the last number used on an ’empty’ file, (currently 146) and change the name on the offending file to the next (’empty 147’). (I think that is all, but am sure that others will check on what I have said.) Oh! remember the obvious thing that renaming a page will create a redirect so go back and clear that as well.
What Tim has outlined is what I recall Toby recommending to do in these cases.
Ok, thanks. So empty 147-151 are born.
Thanks, David, I usually do this but am travelling and was busy. I have also to prepare the the meeting in Paris at the end of the month!
The page meta topological space looks exceeding flaky to me. Not sure what to do about it. Not sure it’s quite spam, but certainly no good in its current state. The author, ’D. Ely’ has also made Meta matrices, which is likewise very odd.
Both look ’flaky’ to me. Perhaps put a polite warning notice on the shorter one giving a time limit for the author to explain what is intended on these pages. What do you think?
My own opinion, for what it’s worth, is that it’s not worth it spending any time dealing with the author. I would just get rid of them.
Thanks, Todd, I agree. That meta topological space one is particularly useless.
One addition to Tim's directions in #507: You should be able to quickly see how high up the empty pages go by checking http://ncatlab.org/nlab/list/empty. But this only works if you make the content of the new empty pages read
category: empty
instead of being literally empty! I have done this up to empty 152 now.
I have cleared “meta topological space” and have renamed “Meta matrices” to hypermatrix, which is a term that is pretty standard in the context of discussion of hyperdeterminants.
I added a reference to hyperdeterminants, linking to an MO discussion of volume interpretations of hyperdeterminants.
516: I disagree that hypermatrix is another term for tensor in more than 2 dimensions. It is equally wrong as claiming that an ordinary matrix is a tensor. Quadratic matrix can represent a tensor in particular basis, but the matrix does not know its origin. It does not know if it represents a covariant 2-tensor, or contravariant 2-tensor or mixed 1-1-tensor, and so on, nor it knows in which basis this representation is taken, hence it is not giving the complete information on a tensor. It is frosen datum of a tensor provided we know the basis. If we do not have this supplementary datum then it is not.
I am on the other hand not sure if the term is used for non-quadratic matrices of higher number of indices/dimensions.
Sure, basis representations. I have added the word to the entry.
Fundamentally, an $m$-by-$n$ matrix with entries from the set $K$ is an element of $K^m \times K^n$, which is not any sort of tensor. However, if $K$ is a field and you wish to add and multiply the matrices in the usual way, then an $n$-by-$n$ matrix is a $(1,1)$-tensor on $K^n$, with multiplication given by contraction. Since $K^n$ comes with a preferred basis, you can interpret such a matrix as a $(0,2)$-tensor or a $(2,0)$-tensor, but this is less direct. This is why people sometimes use the word ‘matrix’ to refer to a $(1,1)$-tensor, even though that is (strictly speaking) improper. (Dually, people sometimes use the word ‘vector’ to refer to a list.)
Why are we discussing this in the Spam thread?
I got serious spam from IP 37.25.117.59 with stupid Russian texts overwriting all my text, today, on 09:57 January 18 on HomePage (zoranskoda) and homotopija lekcija2 (zoranskoda). I rolled it back.
The page Algebres enveloppantes (Cahiers scientifiques, fasc. 37) (French Edition) (French) Paperback – 1974 (created by an Anon Coward at 197.2.58.222) looks to me like the filename of a torrent-sourced copy of a book. In this case, it’s a book by Dixmier, and the title of that page could have been copied verbatim from this Amazon page.
I made that last one a real page and linked to it from universal enveloping algebra.
Mysterious spam from 2405:204:8485:ab49:a8f3:c856:6f17:9f86 at floor. It just says ’3.6’.
What is that type of identifier as a search did not produce any results?
It’s an IPv6 address.
I put some content at floor. (Such content may be discussed in a separate discussion.)
Unclear whether it is technically spam, but have deleted a page ’real line and circle with one point remove is homeomorphic’ created today (its only content was a copy of the title), as well as the announcement which it generated on the nForum.