
In this paper we prove a conjecture that $D(4)$-quintuple does not exist using both classical and new methods. Also, we give a new version of the Rickert's theorem that can be applied on some $D(4)$-quadruples.
38 pages; some mistakes corrected, some explanations added
Pell equations, Mathematics - Number Theory, Reduction method, FOS: Mathematics, Number Theory (math.NT), Diophantine m-tuples ; Pell equations ; Reduction method, Diophantine m-tuples
Pell equations, Mathematics - Number Theory, Reduction method, FOS: Mathematics, Number Theory (math.NT), Diophantine m-tuples ; Pell equations ; Reduction method, Diophantine m-tuples
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