The mathematical expression 9 € T means:

9 union T

9 intersection T

09 is an element of T

9 is not an element of T

09 is an element of T

Step-by-step explanation:

Given:

9 ∈ T

We need to find the Mathematical expression for 9 ∈ T.

Now we know that,

∈ is a Latin letter which is used in set membership and is denoted by "is an element of".

Hence from above we can say that,

9 ∈ T means 9 is an element of T.