State in each case, whether the given statement is true or false :
` 0 in phi `

Answer

To determine whether the statement "0 in φ" is true or false, we need to understand what φ (phi) represents in set theory.

### Step-by-Step Solution:

1. **Understanding φ (phi)**:
- The symbol φ represents the empty set. The empty set is defined as a set that contains no elements at all.

2. **Identifying the Elements of φ**:
- Since φ is the empty set, it does not contain any elements, including the number 0.

3. **Evaluating the Statement**:
- The statement "0 in φ" means that we are claiming that 0 is an element of the empty set. Since we established that the empty set contains no elements, this statement must be false.

4. **Conclusion**:
- Therefore, we conclude that the statement "0 in φ" is false.

### Final Answer:
The statement "0 in φ" is **false**.