1. Recondite: Abstruse
2. Abstruse: Enigmatic
3. Enigmatic: Cabalistic
4. Cabalistic: Arcane
5. Arcane: Esoteric
6. Esoteric: Hermetic
7. Hermetic: Recondite
(This all started when I saw the definition of recondite including the word "abstruse")
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
abstruse : arcane
arcane : esoteric
Found this going back and forth in 4 different online dictionaries.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.