For example, if it's true that it's raining, and it's true that I'm inside, then it's true that it's raining, and I'm inside.
Formally:
A B ∴ ( A ∧ B )
... published also an autobiography entitled Von Magdeburg nach Königsberg (1873), which deals with his life up to the time of his settlement at Königsberg. See Quabicker, ...