User:Barto/Sandbox

Welcome to the help section of. We hope to provide you with the information you are looking for.

Comments: As you can see, text that comes before the sections does not interfere with them; text that comes after does. Please don't focus on the content, I agree that it's incomplete and may use some rearrangement.

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 Editing help Need help editing a page? Check the editing help page for any detailed question on editing you might have. See also our house style guide. The sandbox is a great place to test out your $\LaTeX$ and wiki skills without having to tamper with an actual page. If you don't want to use the main sandbox, you can always create your personal sandbox.

 Create a new page Read the help article on Creating a Page.

 Request a proof Have something that you think should be added but don't know how to prove yourself? Add it to the Wanted proofs list, or create a page for the theorem and use the ProofWanted template. Please note, however, that is a compendium of proofs, not an online math Q&A forum.

 Report a problem with a page You found a problem with the contents of a page and you're not sure what to do? Don't be afraid to correct the error, or read Report a problem for detailed instructions.

 Index of help pages Some text

 Have a question? Check out the FAQ, or search our help section: If you still need help or just want to ask a general question about, please post on the questions page.

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$\begin{CD} A @>a>> B \\ @VVbV @VVcV \\ C @>d>> D \end{CD}$

Second column is incomplete, but sorting works (by specifying keys). Disregard behavior of rows with empty second column. Discuss here or at Mathematician talk:Mathematicians/Sorted By Nation. --barto (talk) 15:31, 16 July 2017 (EDT)