Groups Definition and 906 Threads

Google Groups is a service from Google that provides discussion groups for people sharing common interests. The Groups service also provides a gateway to Usenet newsgroups via a shared user interface.
Google Groups became operational in February 2001, following Google's acquisition of Deja's Usenet archive. Deja News had been operational since March 1995.
Google Groups allows any user to freely conduct and access threaded discussions, via either a web interface or e-mail. There are at least two kinds of discussion group. The first kind are forums specific to Google Groups, which act more like mailing lists. The second kind are Usenet groups, accessible by NNTP, for which Google Groups acts as gateway and unofficial archive. The Google Groups archive of Usenet newsgroup postings dates back to 1981. Through the Google Groups user interface, users can read and post to Usenet groups.In addition to accessing Google and Usenet groups, registered users can also set up mailing list archives for e-mail lists that are hosted elsewhere.

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  1. W

    Proof Using Def. of Groups and Def. of Subgroups

    Hello, This is my question: (i) Let H and K be subgroups of a group G. Prove that the intersection of H and K is also a subgroup of G. (ii) Give an example, using suitable sugroups of the goup of integers with the operation addition, (Z,+), to show that if H and K are subgroups of a...
  2. W

    Defining Groups: Proving Abelian Property

    [SOLVED] Proof Using Def. of Groups Hello, This is my question: Let G be a group. i) Let x and y be elements of G. Prove that (xy)2 = x2y2 iff xy = yx. (Hint: Use the definition g2 = gg). ii) Using part (i) prove that if g2 = u (the unit element) for all g which is an element of...
  3. W

    Understanding Groups in Algebra: A Question of Closure and Inverses

    Hello, I just started doing groups in my algebra class and I am struggling with the abstraction of it as usual. Here is how my class defines a group: A group is a nonempty set G with a binary operation "o" such that for all of x,y,z which are elements of the group the following holds...
  4. Greg Bernhardt

    The Eightfold Way categories which groups of particles?

    The Eightfold Way categories which groups of particles?
  5. K

    What is the Absorption Wavelength of Epoxy Groups?

    Dear Fellow scientists, I have a small but important problem: I need to know the absorption wavelength of epoxy groups. To be more precise, these epoxy groups are bound to an agarose affinity resin via a -((CH)2)12- Spacer. Does anybody know a particular reference or chemistry book I should...
  6. Tyger

    Unveiling the Connection: Rotation Groups & Hyperspheres

    My first post, about rotation groups.. A result about rotation groups. To me this seems clear, simple and very intuitive, but in all the papers and books I've read on the subject I have never seen it presented. Maybe some of you have seen it, or maybe it is new. It is very simple to state...
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