Thema Subject Categories 1.2

Previous versions of Thema are still available 1.1 1.0.

Browse the Thema subject categories hierarchy, or search for a specific term within the hierarchy.

See the search hints below.

Notation Category heading ?
P Mathematics & Science
PB Mathematics
PD Science: general issues
PG Astronomy, space & time
See also: TTD* Space science and its subcategories
PH Physics
PN Chemistry
See also: TDC Industrial chemistry & chemical engineering, TQ* Environmental science, engineering & technology and its subcategories
PS Biology, life sciences
Use PS* codes for academic, specialist and professional level works; prefer WN* codes for natural history etc for the general reader. See also: WN* Nature & the natural world: general interest and its subcategories