Final answer:
The statement 'Alcibiades is not mentioned in the Symposium' is not true as Alcibiades does make a notable appearance, which disrupts the event and highlights his significance in the dialogue.
Step-by-step explanation:
When Alcibiades bursts into the Symposium by Plato, it is implied that Alcibiades is not mentioned in the Symposium is the statement that is NOT true. Alcibiades is indeed present at the Symposium, as his dramatic entrance undoubtedly disrupts the proceedings and underscores his importance as a character within the dialogue. Alcibiades is a well-known historical figure, depicted as a handsome young warrior with a penchant for enjoying life. His political and military actions had significant consequences for Athens, as seen in his role in the Sicilian expedition and the tumultuous events that followed it.