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2. Double check valve - Wikipedia

   en.wikipedia.org/wiki/Double_check_valve

   Double check valve. A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [ 1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest ...

3. Collatz conjecture - Wikipedia

   en.wikipedia.org/wiki/Collatz_conjecture

   For instance, the first counterexample must be odd because f(2n) = n, smaller than 2n; and it must be 3 mod 4 because f 2 (4n + 1) = 3n + 1, smaller than 4n + 1. For each starting value a which is not a counterexample to the Collatz conjecture, there is a k for which such an inequality holds, so checking the Collatz conjecture for one starting ...

4. Check valve - Wikipedia

   en.wikipedia.org/wiki/Check_valve

   A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...

5. Orioles stay in first place thanks to Yankees' miscues, beat ...

   www.aol.com/news/orioles-stay-first-place-thanks...

   Ben Rice hit a three-run homer in the top of the ninth off Craig Kimbrel (6-2) to put the Yankees up 5-3, but New York's closer couldn't hold a lead either. Clay Holmes (1-4) allowed the Orioles ...

6. AOL Mail

   mail.aol.com

   You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

7. Formation (association football) - Wikipedia

   en.wikipedia.org/wiki/Formation_(association...

   Formation (association football) Program for an 1887 game between Blackburn Rovers and Sheffield Wednesday. The players of both teams are arranged in 2–3–5 formation. In association football, the formation of a team refers to the position players take in relation to each other on a pitch. As association football is a fluid and fast-moving ...

8. The Prime Day fashion deals our editors are adding to their ...

   www.aol.com/lifestyle/what-early-prime-day...

   July 15, 2024 at 2:10 PM. The Prime Day fashion deals our editors are adding to their carts — top brands starting at $8. Today is the last day of Amazon’s Prime Day - so get the deals while ...

9. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   Some sequences have alternate names: 4n+1 are Pythagorean primes, 4n+3 are the integer Gaussian primes, and 6n+5 are the Eisenstein primes (with 2 omitted). The classes 10 n + d ( d = 1, 3, 7, 9) are primes ending in the decimal digit d .