“…In a monograph published in 1971 [11], Eberhard Zeidler then developed a general theory for such waves that not only allowed for the efficient computation of the solutions, but also provided the tools for the existence proofs for many other types of waves, as for instance in [12, 19-21, 43, 44] and [1][2][3] with Klaus Beyer. In 1972 [56], he obtained a new and transparent proof for the Bénard problem in the bifurcation and stability theory of the Navier-Stokes equations.…”