Nontrivial vs Unusual - What's the difference?
nontrivial | unusual |
Not trivial.
(mathematics) Having at least one non-zero variable.
(computing) Needing significant computing power to solve; intractable.
Unlike what is expected; differing in some way from the norm.
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, title=(The Celebrity), chapter=2
, passage=I had occasion […] to make a somewhat long business trip to Chicago, and on my return […] I found Farrar awaiting me in the railway station. He smiled his wonted fraction by way of greeting, […], and finally leading me to his buggy, turned and drove out of town. I was completely mystified at such an unusual proceeding.}}
Not usual.