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2. Yahoo Groups - Wikipedia

   en.wikipedia.org/wiki/Yahoo_Groups

   Groups. Yahoo! Yahoo! Groups was a free-to-use system of electronic mailing lists offered by Yahoo! . Prior to February 2020, Yahoo! Groups was one of the world's largest collections of online discussion boards. It allowed members to subscribe to various groups, read subscribed discussions online, view and share photos, files and bookmarks ...

3. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Mathematics is a field of study that discovers and organizes methods, theories and theorems that are developed and proved for the needs of empirical sciences and mathematics itself. There are many areas of mathematics, which include number theory (the study of numbers), algebra (the study of formulas and related structures), geometry (the study ...

4. Glossary of mathematical symbols - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_mathematical...

   A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...

5. Group (online social networking) - Wikipedia

   en.wikipedia.org/wiki/Group_(online_social...

   Group (online social networking) A group (often termed as a community, e-group or club) is a feature in many social networking services which allows users to create, post, comment to and read from their own interest- and niche-specific forums, often within the realm of virtual communities. Groups, which may allow for open or closed access ...

6. 6-year-old provides the most genius answer to his math problem

   www.aol.com/article/2015/11/04/6-year-old...

   Sometimes the way kids respond to math tests are incredibly funny and even smarter than the answers their teachers expect. While everyone hates taking tests, some students are creative enough to ...

7. Free group - Wikipedia

   en.wikipedia.org/wiki/Free_group

   Two free groups F S and F T are isomorphic if and only if S and T have the same cardinality. This cardinality is called the rank of the free group F. Thus for every cardinal number k, there is, up to isomorphism, exactly one free group of rank k. A free group of finite rank n > 1 has an exponential growth rate of order 2n − 1. A few other ...