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Old 12-31-2010, 10:03 AM   #26 (permalink)
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Originally Posted by Piwoslaw View Post
"OK, let's use this equation in an example with actual numbers, like a, b, and c."
Yes, as much as possible. That variable/constant distinction is great. Or better when one says "R is a binary relation" or "H is an operator". Even without letters, "constants" such as 0 seem pretty arbitrary. Now I learn the number 0 is just another name for the empty set because of von Neumann ordinals.
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