Non-Trivial

Non-Trivial is sometimes used by engineers / scientist to (jokingly?) describe the extremely difficult problems that they are faced with.

Some Non-Trivial problems.

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Build this suspension bridge out of string and Duct-tape.

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non-trivial

Non-arbitrary.

Existing in ultrafinitive space rather than ultra-nihilistic space.

A non-trivial solution exists within the bounds of pan-contiguity. Specifically: non-trivial solutions can be expressed as a function of the ultra-finitive space of local heat-conservation (the-turquoise-line).