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2. Ordered pair - Wikipedia

   en.wikipedia.org/wiki/Ordered_pair

   The ordered pair (a, b) is different from the ordered pair (b, a), unless a = b. In contrast, the unordered pair, denoted {a, b}, equals the unordered pair {b, a}. Ordered pairs are also called 2-tuples, or sequences (sometimes, lists in a computer science context) of length 2. Ordered pairs of scalars are sometimes called 2-dimensional vectors.

3. Ordinal number - Wikipedia

   en.wikipedia.org/wiki/Ordinal_number

   For each well-ordered set T, < defines an order isomorphism between T and the set of all subsets of T having the form <:= {<} ordered by inclusion. This motivates the standard definition, suggested by John von Neumann at the age of 19, now called definition of von Neumann ordinals : "each ordinal is the well-ordered set of all smaller ordinals".

4. Abscissa and ordinate - Wikipedia

   en.wikipedia.org/wiki/Abscissa_and_ordinate

   Illustration of a plane, showing the absolute values (unsigned dotted line lengths) of the coordinates of the points (2, 3), (0, 0), (−3, 1), and (−1.5, −2.5). The first of these signed ordered pairs is the abscissa of the corresponding point, and the second value is its ordinate.

5. Relation (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Relation_(mathematics)

   As an example, "is less than" is a relation on the set of natural numbers; it holds, for instance, between the values 1 and 3 (denoted as 1 < 3), and likewise between 3 and 4 (denoted as 3 < 4), but not between the values 3 and 1 nor between 4 and 4, that is, 3 < 1 and 4 < 4 both evaluate to false.

6. Tuple - Wikipedia

   en.wikipedia.org/wiki/Tuple

   A 1‑tuple is called a single (or singleton), a 2‑tuple is called an ordered pair or couple, and a 3‑tuple is called a triple (or triplet). The number n can be any nonnegative integer . For example, a complex number can be represented as a 2‑tuple of reals, a quaternion can be represented as a 4‑tuple, an octonion can be represented as ...

7. QVC recalls 1.1 million pairs of oven gloves after users ...

   www.aol.com/qvc-recalls-1-1-million-184754508.html

   QVC is recalling 1.1 million pairs of oven gloves because the products pose a burn hazard, the live shopping entertainment company said in a notice posted on Thursday by the Consumer Product ...