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Terminological nitpick: equality is a relation, not an operation. What you refer to as a "commutative operation" is more accurately described as a "symmetric relation".

3M Micropore Surgical Tape.

echo $(expr '(' $(date -d 2070-01-01 +%s) - $(date +%s) + 86399 ')' / 604800) " weeks until I turn 80"

Pentadactyl alone did it for me.

This advice falls under the general pattern of addressing a relatable problem and offering a solution that validates the reader's intuition without explaining how to make the behav…

See also http://typing.io/lessons

What do you mean by 'above infinity'?

How well would this work for a desktop environment, in combination with a Leap?

Learn to use Spaced Repetition software like Anki or Mnemosyne.

The results seem consistent with previous data. There are many recent layouts (e.g. Colemak[1]) which attempt further optimization, but simulations show little actual difference in…