[FOM] Direction of tree growth

Andrej Bauer andrej.bauer at andrej.com
Wed Aug 8 11:39:03 EDT 2012

Mathematicians seem to grow them upwards, the way Nature does.

Computer scientists grow trees downards, the way they grow in Australia.

This is so because mathematicians can calculate tree height in their
heads before drawing the tree, so they know how much blank space to
skip. Computer scientists cannot compute, so they just decided to be
practical instead.

With kind regards,


On Wed, Aug 8, 2012 at 2:15 AM, Colin McLarty <colin.mclarty at case.edu> wrote:
> Is there any standard preference in reverse mathematics for trees to
> grow upwards or downwards?
> best, Colin
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