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. 



Where to publish a new proof of an old theorem?
If the old theorem is something commonly seen in an undergraduate math class (with the old demonstration), then this might be appropriate as a "Note" in the *American Mathematical Monthly*. 


What could happen if you submit it? They may publish it. The referee may give you a reference for it. They may respond in the same way as the *Gazette*. 


What if the old theorem is not commonly seen in an undergraduate math course? When you write a textbook on that area of math, you can include your new proof. But if you think it unlikely you will write a textbook on this, then probably there is little prospect for publishing this. Maybe if you make it known to the experts\* then some day one of them may include it in their new textbook.


\*Perhaps by posting somewhere on-line... 


