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2. List of undecidable problems - Wikipedia

   en.wikipedia.org/wiki/List_of_undecidable_problems

   For functions in certain classes, the problem of determining: whether two functions are equal, known as the zero-equivalence problem (see Richardson's theorem); [5] the zeroes of a function; whether the indefinite integral of a function is also in the class. [6] Of course, some subclasses of these problems are decidable.

3. Logical reasoning - Wikipedia

   en.wikipedia.org/wiki/Logical_reasoning

   This support comes in degrees: strong arguments make the conclusion very likely, as is the case for well-researched issues in the empirical sciences. [ 1 ] [ 16 ] Some theorists give a very wide definition of logical reasoning that includes its role as a cognitive skill responsible for high-quality thinking.

4. Strength (mathematical logic) - Wikipedia

   en.wikipedia.org/wiki/Strength_(mathematical_logic)

   This mathematical logic -related article is a stub. You can help Wikipedia by expanding it.

5. Quizlet - Wikipedia

   en.wikipedia.org/wiki/Quizlet

   Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards , matching games , practice electronic assessments , and live quizzes.

6. Validity (logic) - Wikipedia

   en.wikipedia.org/wiki/Validity_(logic)

   Argument terminology used in logic. In logic, an argument is a set of related statements expressing the premises (which may consists of non-empirical evidence, empirical evidence or may contain some axiomatic truths) and a necessary conclusion based on the relationship of the premises.

7. Soundness - Wikipedia

   en.wikipedia.org/wiki/Soundness

   In logic and deductive reasoning, an argument is sound if it is both valid in form and has no false premises. [1] Soundness has a related meaning in mathematical logic, wherein a formal system of logic is sound if and only if every well-formed formula that can be proven in the system is logically valid with respect to the logical semantics of the system.