Mathematics
Isomorphism (crystallography)
Class (philosophy)
Ideal (ethics)
Notation
Decomposition
Representation (politics)
Algebra over a field
Pure mathematics
Group (periodic table)
Domain (mathematical analysis)
Combinatorics
Discrete mathematics
Arithmetic
Mathematical analysis
Computer science
Artificial intelligence
Ecology
Philosophy
Chemistry
Organic chemistry
Epistemology
Politics
Political science
Crystal structure
Law
Biology
Crystallography
