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2. Truth table - Wikipedia

   en.wikipedia.org/wiki/Truth_table

   A truth table is a structured representation that presents all possible combinations of truth values for the input variables of a Boolean function and their corresponding output values. A function f from A to F is a special relation, a subset of A×F, which simply means that f can be listed as a list of input-output pairs.

3. Tautology (logic) - Wikipedia

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

   Tautology (logic) In mathematical logic, a tautology (from Ancient Greek: ταυτολογία) is a formula that is true regardless of the interpretation of its component terms, with only the logical constants having a fixed meaning. For example, a formula that states, "the ball is green or the ball is not green," is always true, regardless of ...

4. Folding table - Wikipedia

   en.wikipedia.org/wiki/Folding_table

   Folding table. General use Folding Table. A folding table is a type of folding furniture, a table with legs that fold up against the table top. This is intended to make storage more convenient and to make the table more portable. Many folding tables are made of lightweight materials to further increase portability.

5. Prepare for the big game with this best-selling folding table ...

   www.aol.com/lifestyle/walmart-folding-table-deal...

   Mainstays 4 Foot Fold-in-Half Adjustable Folding Table. $35 $40 Save $5. Useful for game day and beyond, this adjustable folding table can be pulled out whenever you need a little bit of extra ...

6. Four-valued logic - Wikipedia

   en.wikipedia.org/wiki/Four-valued_logic

   A four-valued logic was established by IEEE with the standard IEEE 1364: It models signal values in digital circuits. The four values are 1, 0, Z and X. 1 and 0 stand for boolean true and false, Z stands for high impedance or open circuit and X stands for don't care (e.g., the value has no effect).

7. Mathematics of paper folding - Wikipedia

   en.wikipedia.org/wiki/Mathematics_of_paper_folding

   Mathematics of paper folding. Map folding for a 2×2 grid of squares: there are eight different ways to fold such a map along its creases. The discipline of origami or paper folding has received a considerable amount of mathematical study. Fields of interest include a given paper model's flat-foldability (whether the model can be flattened ...