Prove the Following Claim

question 18

Essay

Prove the following claim:
A conjunction with one self-contradictory conjunct must itself be
a self-contradiction.

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Definitions:

Tertiary Education

Education at the post-secondary level, including universities, colleges, and vocational schools, following primary and secondary education.

Primary Education

The first stage of formal education in many countries, designed for young children by providing basic reading, writing, and mathematical skills along with an elementary understanding of other subjects.

Middle School

An educational institution or stage serving as an intermediary phase between elementary school and high school, typically catering to students in early adolescence.

Elementary School

An educational institution for young children that provides foundational knowledge and skills, typically ranging from kindergarten through grades 4-6.