Navier-Stokes
Describes fluid flow by tracking the energy types and directions in the flow. It can be solved using simplified assumptions and approximations but mathematically it’s not known if there is a general or continuous solution to it for all possible inputs.
P-NP
Some computational problems seem to be unable to solve with an algorithm quicker than it takes to brute force the problem. The problems is mathematically proving that there is no algorithm for any given comuptation and it’s not that we haven’t found it.
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