If you are looking for specific functional analysis "patches" or modules, they are primarily found in these three books:
If you are looking for comprehensive papers or introductions to functional analysis, consider these open academic resources: schaum functional analysis pdf patched
Spectral theory generalizes the concept of eigenvalues and eigenvectors from finite-dimensional linear algebra to infinite-dimensional operators. Compact Operators: If you are looking for specific functional analysis
: Hundreds of examples with full step-by-step solutions. schaum functional analysis pdf patched