54C65 Selections [See also <a href="#code:28B20">28B20</a>]

54C99 None of the above, but in this section

54D05 Connected and locally connected spaces (general aspects)

54D10 Lower separation axioms ($T_0$--$T_3$, etc.)

54D15 Higher separation axioms (completely regular, normal, perfectly or collectionwise normal, etc.)

54D20 Noncompact covering properties (paracompact, Lindelöf, etc.)

54D25 “$P$-minimal” and “$P$-closed” spaces

54D35 Extensions of spaces (compactifications, supercompactifications, completions, etc.)

54D80 Special constructions of spaces (spaces of ultrafilters, etc.)

54D99 None of the above, but in this section

54E05 Proximity structures and generalizations

54E15 Uniform structures and generalizations

54E18 $p$-spaces, $M$-spaces, $\sigma$-spaces, etc.

54E20 Stratifiable spaces, cosmic spaces, etc.

54E45 Compact (locally compact) metric spaces

54E99 None of the above, but in this section

54F05 Linearly ordered topological spaces, generalized ordered spaces, and partially ordered spaces [See also <a href="#code:06B30">06B30</a>, <a href="#code:06F30">06F30</a>]

54F35 Higher-dimensional local connectedness [See also <a href="#code:55Mxx">55Mxx</a>, <a href="#code:55Nxx">55Nxx</a>]

54F45 Dimension theory [See also <a href="#code:55M10">55M10</a>]

54F50 Spaces of dimension $\leq 1$; curves, dendrites [See also <a href="#code:26A03">26A03</a>]

54F65 Topological characterizations of particular spaces

54F99 None of the above, but in this section

54G05 Extremally disconnected spaces, $F$-spaces, etc.

54G99 None of the above, but in this section

54Hxx Connections with other structures, applications

54H05 Descriptive set theory (topological aspects of Borel, analytic, projective, etc. sets) [See also <a href="#code:03E15">03E15</a>, <a href="#code:26A21">26A21</a>, <a href="#code:28A05">28A05</a>]

54H10 Topological representations of algebraic systems [See also <a href="#code:22-XX">22-XX</a>]

54H11 Topological groups [See also <a href="#code:22A05">22A05</a>]

54H12 Topological lattices, etc. [See also <a href="#code:06B30">06B30</a>, <a href="#code:06F30">06F30</a>]