New Rough Set Approximation Spaces

Table 1

The set 𝐴⊆𝑋	𝛼𝑅(𝐴)	𝛼𝑅𝛽(𝐴)	𝛼∧𝛽(𝐴)
{𝑎}	1/2	1	1
{𝑏}	0	0	0
{𝑐}	0	0	1
{𝑑}	1/3	1/2	1/2
{𝑎,𝑏}	1/3	1/2	1/2
{𝑎,𝑐}	1/2	1	1
{𝑎,𝑑}	1/2	1/2	2/3
{𝑏,𝑐}	0	0	1/2
{𝑏,𝑑}	2/3	1	1
{𝑐,𝑑}	1/3	2/3	2/3
{𝑎,𝑏,𝑐}	1/3	2/3	2/3
{𝑎,𝑏,𝑑}	3/4	3/4	1
{𝑎,𝑐,𝑑}	3/4	3/4	3/4
{𝑏,𝑐,𝑑}	2/3	1	1