35/ to whit, the old "a line that intersects paralllel lines creates corresponding angles" proof (not axiom?) http://www.mathnstuff.com/math/spoken/here/2class/260/trans.htm …
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note that something similar is done w train bogies for long loadspic.twitter.com/cON40J8vt7
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...so I've been thinking about how to support a fixed monolithic roof on a bed of 4-8 bases that suffer frost heaves.
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