nikol


Total Posts: 1126 
Joined: Jun 2005 


Must be very handy...
https://arxiv.org/abs/1908.03795
Discoveries are still made.
I got it from this article https://www.quantamagazine.org/neutrinosleadtounexpecteddiscoveryinbasicmath20191113/ 



mtsm


Total Posts: 251 
Joined: Dec 2010 


Saw that, quite romantic I must say... 


nikol


Total Posts: 1126 
Joined: Jun 2005 


Forgot to update. Thanks.
It appears that this result is known (in russian): "Calculation of eigenvalues and eigenvectors in meshtype problems (Algorithms and error estimations)" (1986) http://math.ucdenver.edu/~aknyazev/research/papers/old/k.pdf
and there the following is referenced: "Error bounds in RayleighRitz approximation of eigenvectors" (1934) https://pdfs.semanticscholar.org/dd58/71b7a8e6c07071bc04e483c09841919f80e3.pdf
so, thanks to social media for popping up the subject 



zee4


Total Posts: 77 
Joined: May 2010 


Did he write the equations by hand? Or is it 80's LaTeX? 
Бухарский 

nikol


Total Posts: 1126 
Joined: Jun 2005 


As far as I remember 90% of university preprints in soviet times were with handwriting formulas. 


