Problem 85 (difficulty: 3/10)

Prove the De Morgan identities, i.e., \(\displaystyle \overline{A\cup B}=\overline A\cap \overline B,\) and \(\displaystyle \overline{A\cap B}=\overline A\cup \overline B.\)

Give me another random problem!

Subject, section:
Requested difficulty:
Request for a concrete problem:I want problem no.

Supported by the Higher Education Restructuring Fund allocated to ELTE by the Hungarian Government