tokens: K. S. Croker warmly acknowledges: N. Kaiser (ENS) for numerous conversations clarifying the historical understanding of pressure within FLRW models; X. Tata (Hawai‘i) for penetrating feedback and explicit revisions; E. Mottola (LANL) for traveling to Hawai‘i for discussions concerning applications of this work and for pointing out omissions in early arguments; D. Farrah (Hawai‘i) for comments on clarity; J. D. Bjorken (SLAC) for regular correspondence and encouragement; and I. Szapudi (IfA) for criticism, which significantly strengthened the arguments presented. Portions of this work were performed with financial support from the Fulbright U.S. Student Program and the UH Vice Chancellor for Research. Software : Maxima 8 8 http://maxima.sourceforge.net (Maxima 2019 ).
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