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2. Well-order - Wikipedia

   en.wikipedia.org/wiki/Well-order

   Unlike the standard ordering ≤ of the natural numbers, the standard ordering ≤ of the integers is not a well ordering, since, for example, the set of negative integers does not contain a least element. The following binary relation R is an example of well ordering of the integers: x R y if and only if one of the following conditions holds ...

3. Online dating - Wikipedia

   en.wikipedia.org/wiki/Online_dating

   Since the 2010s, Internet dating has become more popular with smartphones. Online dating, also known as internet dating, virtual dating, or mobile app dating, [1] is a method used by people with a goal of searching for and interacting with potential romantic or sexual partners, via the internet.

4. Ordered field - Wikipedia

   en.wikipedia.org/wiki/Ordered_field

   A fan on F is a preordering T with the property that if S is a subgroup of index 2 in F ∗ containing T − {0} and not containing −1 then S is an ordering (that is, S is closed under addition). [9] A superordered field is a totally real field in which the set of sums of squares forms a fan. [10]

5. Well-ordering principle - Wikipedia

   en.wikipedia.org/wiki/Well-ordering_principle

   In Peano arithmetic, second-order arithmetic and related systems, and indeed in most (not necessarily formal) mathematical treatments of the well-ordering principle, the principle is derived from the principle of mathematical induction, which is itself taken as basic.

6. Cost per order - Wikipedia

   en.wikipedia.org/wiki/Cost_per_order

   Cost per order, also called cost per purchase, is the cost of internet advertising divided by the number of orders.Cost per order, along with cost per impression and cost per click, is the starting point for assessing the effectiveness of a company's internet advertising and can be used for comparison across advertising media and vehicles and as an indicator of the profitability of a firm's ...

7. Mobile ticketing - Wikipedia

   en.wikipedia.org/wiki/Mobile_ticketing

   Mobile ticketing is the process whereby customers order, pay for, obtain, and validate tickets using mobile phones. A mobile ticket contains a verification unique to the holder's phone. A mobile ticket contains a verification unique to the holder's phone.