Discussion
What is a logical equivalence?
Answer: D
Equivalent sentences have identical truth in every model, so either may replace the other anywhere without changing what is entailed. Mutual derivability coincides with it in a sound and complete system. Symbol counts are irrelevant and the last option is far too weak. Equivalences such as De Morgan's laws and the distributive laws are the tools by which a formula is rewritten into normal form, so knowing them as equivalences rather than as inference rules is what licenses the rewriting.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development