TY  - JOUR
AB  - Following Ma, Yonghao and Yi Lin's definition of a mathematical model of general systems in 1987, shows the class of all general systems with relation‐reversion mappings and that of all general systems with relation‐preserving mappings to be productive, co‐productive categories Answers two questions posed in earlier published papers and poses some more questions for solution.
VL  - 22
IS  - 8
SN  - 0368-492X
DO  - 10.1108/eb006004
UR  - https://doi.org/10.1108/eb006004
AU  - Yang Zhanbo
PY  - 1993
Y1  - 1993/01/01
TI  - Categorical Methods in General Systems Theory and Linked Time Systems Series
T2  - Kybernetes
PB  - MCB UP Ltd
SP  - 37
EP  - 53
Y2  - 2024/04/26
ER  -