Start with the theorem "If two angles of a triangle are equal, the triangle is isosceles," and the following four statements:

1. If two angles of a triangle are not equal, the triangle is not isosceles.
2. The base angles of an isosceles triangle are equal.
3. If a triangle is not isosceles, then two of its angles are not equal.
4. A necessary condition that two angles of a triangle be equal is that the triangle be isosceles.

Which combination of statements contains only those which are logically equivalent to the given theorem?

$ \textbf{(A)}\ 1,\,2,\,3,\,4 \qquad 
\textbf{(B)}\ 1,\,2,\,3\qquad 
\textbf{(C)}\ 2,\,3,\,4\qquad 
\textbf{(D)}\ 1,\,2\qquad 
\textbf{(E)}\ 3,\,4$
To determine which statements are logically equivalent to the given theorem, we need to analyze each statement in the context of the theorem: "If two angles of a triangle are equal, the triangle is isosceles."

1. **Statement 1: If two angles of a triangle are not equal, the triangle is not isosceles.**
   - This is the contrapositive of the given theorem. The contrapositive of a statement is logically equivalent to the original statement. Therefore, this statement is logically equivalent to the given theorem.

2. **Statement 2: The base angles of an isosceles triangle are equal.**
   - This is a well-known property of isosceles triangles. However, it is not directly the same as the given theorem. The given theorem states that if two angles are equal, then the triangle is isosceles, while this statement states that if a triangle is isosceles, then the base angles are equal. This is the converse of the given theorem, which is not necessarily logically equivalent.

3. **Statement 3: If a triangle is not isosceles, then two of its angles are not equal.**
   - This is the contrapositive of the converse of the given theorem. The contrapositive of the converse is logically equivalent to the converse, but not necessarily to the original theorem. Therefore, this statement is not logically equivalent to the given theorem.

4. **Statement 4: A necessary condition that two angles of a triangle be equal is that the triangle be isosceles.**
   - This statement is essentially a rephrasing of the given theorem. It states that for two angles to be equal, the triangle must be isosceles, which is the same as saying if two angles are equal, then the triangle is isosceles. Therefore, this statement is logically equivalent to the given theorem.

Based on the analysis, the statements that are logically equivalent to the given theorem are Statements 1 and 4.

The final answer is $\boxed{(E)}$.