<div dir="ltr"><div>Dear colleagues.</div><div><br></div>Does somebody know where the equation “a times d/2 over c^2” shows up in the papers from Einstein? It's related to the Equivalency Principle of acceleration and gravitation.<div><p class="gmail-qtext_para" style="margin:0px 0px 1em;padding:0px;color:rgb(51,51,51);font-family:q_serif,Georgia,Times,"Times New Roman",serif;font-size:13px;background-color:rgb(246,246,246)">I mean this one:</p><div class="gmail-qtext_image_wrapper" style="margin-bottom:1em;color:rgb(51,51,51);font-family:q_serif,Georgia,Times,"Times New Roman",serif;font-size:13px;background-color:rgb(246,246,246)"><img class="gmail-landscape gmail-qtext_image gmail-zoomable_in gmail-zoomable_in_feed" src="https://qph.ec.quoracdn.net/main-qimg-44f5a07e82427f27c7b11847c2b9c24e.webp" style="border: 0px; animation-duration: 0.001s; animation-name: insQ_100; display: block; max-width: 100%; cursor: -webkit-zoom-in; border-radius: 3px;"></div><p class="gmail-qtext_para" style="margin:0px;padding:0px;color:rgb(51,51,51);font-family:q_serif,Georgia,Times,"Times New Roman",serif;font-size:13px;background-color:rgb(246,246,246)">If "d" stands for "distance", it would be the radial distance to the central mass divided by 2. I would like to know: why, in what context. If it would be “diameter”/2 it would be a*d resulting in v^2. So, v^2/c^2 would make more sense to me. But it seems very unusual to use "d" for "diameter". I saw this equation in a paper from Carl Johnson: <span class="gmail-qlink_container"><a href="https://www.academia.edu/8089356/General_Relativity_Time_Dilation_Logical_Error" rel="noopener nofollow" target="_blank" class="external_link gmail-tooltip_parent" style="background:url("//qsf.ec.quoracdn.net/-3-images.new_grid.external_link.svg-26-aef78ead48f1f1e2.svg") 100% 0.3em/10.5px no-repeat;color:rgb(43,109,173);outline:0px;padding-right:15px">General Relativity Time Dilation Logical Error</a></span></p><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div dir="ltr"><font face="comic sans ms, sans-serif" size="2"><b>Ruud Loeffen</b></font><div><a href="http://www.human-DNA.org" target="_blank" style="font-size:12.8px">http://www.human-DNA.org</a><br></div><div><br></div></div></div></div>
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