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<p>Proper-acceleration's relationships to coordinate acceleration in a specified slice of flat spacetime follo from <a href="page.php?w=Hermann_Minkowski">Minkowski</a>'s flat-space metric equation .  Here a single reference frame of yardsticks and synchronized clocks define map position <b>x</b> and map time t respectively, the traveling object's clocks define <a href="page.php?w=proper_time">proper time</a> ?, and the "d" preceding a coordinate means infinitesimal change.  These relationships allow one to tackle various problems of "anyspeed engineering",</p><p>
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