46Nxx Miscellaneous applications of functional analysis

46N10  Applications in optimization, convex analysis, mathematical
               programming, economics
46N20  Applications to differential and integral equations
46N30  Applications in probability theory and statistics
46N40  Applications in numerical analysis, See also {65Jxx}
46N50  Applications in quantum physics
46N55  Applications in statistical physics
46N60  Applications in biology and other sciences
46N99  None of the above but in this section