Merge branch 'document_basis' of github.com:flatironinstitute/nemos i…

…nto document_basis

docs/background/basis/README.md

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 Here, $\approx$ means "approximately equal". 
 
-Instead of tackling the hard problem of learning an unknown function $f(x)$ directly, we reduce it to the simpler task of learning the weights $\{\alpha_i\}$.
+Instead of tackling the hard problem of learning an unknown function $f(x)$ directly, we reduce it to the simpler task of learning the weights $\{\alpha_i\}$. This preserves convexity, resulting in a much simpler optimization problem.
 
 
 ## Basis in NeMoS