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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
Change the target language to find translations.
Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.
Mathematical Reviews is a journal and online database published by the American Mathematical Society (AMS) that contains brief synopses (and occasionally evaluations) of many articles in mathematics, statistics and theoretical computer science.
The journal was founded by Otto E. Neugebauer in 1940 as an alternative to the German journal Zentralblatt für Mathematik. The goal was to give reviews of every mathematical research publication. As of November 2007, the Mathematical Reviews database contained information on over 2.2 million articles. The authors of reviews are volunteers, usually chosen by the editors because of some expertise in the area of the article. It and Zentralblatt für Mathematik are the only comprehensive resources of this type. (The Mathematics section of Referativny Zhurnal is available only in Russian and is smaller in scale and difficult to access.) Often reviews give detailed summaries of the contents of the paper, sometimes with critical comments by the reviewer and references to related work. However, reviewers are not encouraged to criticize the paper, because the author does not have an opportunity to respond. The author's summary may be quoted when it is not possible to give an independent review, or when the summary is deemed adequate by the reviewer or the editors. Only bibliographic information may be given when a work is in an unusual language, when it is a brief paper in a conference volume, or when it is outside of the primary scope of the Reviews. Originally the reviews were written in several languages, but later an "English only" policy was introduced. Selected reviews (called "featured reviews") were also published as a book by the AMS, but this program has been discontinued.
|Producer||American Mathematical Society (USA)|
|Providers||American Mathematical Society|
|Temporal coverage||Early 1800s - present|
|Number of records||Over 2,000,000|
|Print title||Mathematical Reviews|
|Print title||1940 - present|
In 1980, all the contents of Mathematical Reviews since 1940 were integrated into an electronic searchable database. Eventually the contents became part of MathSciNet, which, along with reviews, also has now citation information (albeit primarily limited to other articles in MathSciNet). Mathematical Reviews and MathSciNet have become an essential tool for researchers in the mathematical sciences.
Unlike most other abstracting databases, MathSciNet takes care to identify authors properly. Its author search allows the user to find publications associated with a given author record, even if multiple authors have exactly the same name. Math Reviews personnel will sometimes even contact authors to ensure that the database has correctly attributed their papers. On the other hand, the general search menu uses string matching in all fields, including the author field. This functioning is needed for the database to access some old reviews (before 1940) which have not yet been completely integrated and thus cannot be found by searching for the author first.
MathSciNet provides BibTeX entries with all reviews, and its abbreviations of journal titles have become a de facto standard in mathematical publishing. Both Mathematical Reviews and Zentralblatt für Mathematik use the Mathematics Subject Classification codes for organizing their reviews.
MathSciNet contains information on about 2 million articles from 1,900 mathematical journals, many of them abstracted "cover-to-cover". In addition, reviews or bibliographical information on selected articles is included from many engineering, computer science and other applied journals abstracted by MathSciNet. The selection is done by the editors of the Mathematical Reviews. The editors accept suggestions to cover additional journals, but do not reconsider missing articles for inclusion.
Mathematical Reviews computes a "mathematical citation quotient" (MCQ) for each journal. Like the impact factor, this is a numerical statistic that measures the frequency of citations to a journal. The MCQ is calculated by counting the total number of citations into the journal that have been indexed by Mathematical Reviews over a five year period, and dividing this total by the total number of papers published by the journal during that five year period.
For the period 2004–2008, the top five journals in Mathematical Reviews by MCQ were:
The "All Journal MCQ" is computed by considering all the journals indexed by Mathematical Reviews as a single meta-journal, which makes it possible to determine if a particular journal has a higher or lower MCQ than average. The 2009 All Journal MCQ is 0.28.