TY  - BOOK
ED  - Milton Keynes. Open University
TI  - Operations and morphisms
SN  - 0335010024
U1  - 512 
PY  - 1970///
CY  - Milton Keynes
PB  - Open University Press
KW  - Mathematical models
KW  - Mathematics--Study and teaching - Set theory
N1  - Unit 3
ER  -