Commutative Pseudo Valuations on BCK-Algebras

Table 2

∗-operation.

∗	0	𝑎	𝑏	𝑐	𝑑
0	0	0	0	0	0
𝑎	𝑎	0	𝑎	0	0
𝑏	𝑏	𝑏	0	0	0
𝑐	𝑐	𝑐	𝑐	0	0
𝑑	𝑑	𝑑	𝑑	𝑐	0