Sentence examples for rigourous proof from inspiring English sources

For the ground state (where (L_z=0)), one has that begin{aligned} E_0(B) = sum _{k=0}^{infty } E_k B^{2k} end{aligned} (3.6 Avron [20] found a Bender Wu type formula begin{aligned} E_k = left( frac{4}{pi }right) ^{5/2} (-1)^{k+1} pi ^{-2k} Gamma left( 2k+frac{3}{2}right) left( 1+text {O}left( frac{1}{k}right) right) end{aligned} (3.7 with a rigourous proof by Helffer Sjöstrand [234].

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They often sit on company boards, where their input is welcomed as practical, relevant and rigourous.

Notably, they are demanding Athens "undertake rigourous reviews and modernisation" of collective bargaining and industrial action.

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