User talk:Sds57
Welcome!
[edit]Hello, Sds57, and welcome to Wikipedia! Thank you for your contributions, especially what you did for Mutual information. I hope you like the place and decide to stay. Here are a few links to pages you might find helpful:
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Please remember to sign your messages on talk pages by typing four tildes (~~~~); this will automatically insert your username and the date. If you need help, check out Wikipedia:Questions, ask me on my talk page, or ask your question on this page and then place {{Help me}} before the question. Again, welcome! benmoore 17:20, 5 March 2014 (UTC)
Empty sum
[edit]Hi! Thanks for answering the clarification requests at "empty sum". However, set union cannot be the monoid operation, as this would imply Sum(A) = Sum(A union A) = Sum(A) + Sum(A) for every set A. See also the new discussion at Talk:Empty sum#New section about the convention - your contributions are wellcome there. - Jochen Burghardt (talk) 17:45, 31 July 2019 (UTC)