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A comment on “Infinitely Rich” Mathematician Richard Guy Turns 100. Parent comment

Re:“Infinitely Rich” Mathematician Richard Guy Turns 100 by frikk on Friday September 30, 2016 @07:40PM (#12615869)
I don't think I get it. What is the difference between 'at' and 'up' in this context?
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Re:“Infinitely Rich” Mathematician Richard Guy Turns 100 by pd1 on Friday September 30, 2016 @07:46PM (#12615891)
Maybe going on trails on/around the mountain as opposed to heading to the top?
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