[overkalix]

On the other hand, you've got a "coder" that doesn't know what LU decomposition is...

[plafl]

Different people have different ideas of the meaning of "understanding". Take simple concepts like "time" and ask a physicist.

[coldtea]

So, just like 99.99% of coders, including famous coders whose output and results run circles around many coders who do know what it is?

[user-the-name]

That would be the norm, yes.