Abstract
In 1976 Morten Tveitereid and Enok Palm established that the preference for down-hexagons in high Prandtl number fluids in an internally heated layer is changed to a preference for up-hexagons for Prandtl numbers below Pc=0.2506. In this note it is demonstrated analytically that in a slightly modified problem the critical Prandtl number Pc=1/4 holds exactly.
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