54Bxx Basic constructions

• 54B05 Subspaces
• 54B10 Product spaces
• 54B15 Quotient spaces, decompositions
• 54B17 Adjunction spaces and similar constructions
• 54B20 Hyperspaces
• 54B30 Categorical methods, See also {18B30}
• 54B35 Spectra
• 54B40 Presheaves and sheaves, See also {18F20}
• 54B99 None of the above but in this section