Bertrand-Chebyshev theorem en · PROPN
Etymology
From the surname of Joseph Louis François Bertrand, who conjectured the theorem, and the surname of Pafnuty Chebyshev who proved it.
Meanings
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the theorem that there is at least one prime number between n and 2n for every n>1, i.e.
∀n∈ℕ:n>1⇒∃p∈ℙ:n<p<2n