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 )
... may be mentioned: Philosophical Kritik der Schleiermacherschen Glaubenslehre (1836) Psychologie oder Wissenschaft vom subjektiven Geist (1837; 3rd ed., ...