A few months ago I came up with a proof for an old theorem. After being excited for a moment, I then tried to find my proof in the literature. Since I did not find it, then I started to wonder if it was worth publishing it.
I asked a few people about journals that could publish something like this, and they gave me two recommendations:
(1) The Mathematical Gazette, http://www.m-a.org.uk/the-mathematical-gazette
(2)The Plus Magazine, https://plus.maths.org/content/about-plus
First I submitted to the Mathematical Gazette, and my article was rejected because according to the reviewer I was trying to prove something very simple using something much more complex (although I just used undergraduate level math).
Then I submitted to Plus, and it was also rejected by the editors (it probably doesn't fit well with their magazine).
Do you have any suggestions? Thanks.