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2. Best video doorbell of 2023 - AOL

   www.aol.com/lifestyle/ding-dong-best-video...

   Although it's one of the more expensive video doorbells at $260, the Eufy Video Doorbell Dual doesn't hit you up with fees or subscriptions. If you want maximum video coverage of your porch area ...

3. Amazon just knocked up to $220 off Eufy wireless home ... - AOL

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   Eufy's video doorbell not only gives you a clear view of the action — it lets you speak in real time via two-way audio. The eufy video doorbell uses artificial intelligence and a sophisticated ...

4. Never miss another package delivery with a Eufy video ... - AOL

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   Here are the top deals on Eufy video doorbells as of Feb. 22: OUR TOP PICK: Eufy Security Video Doorbell with HomeBase — save $50 BEST FOR HOMES WITH EXISTING DOORBELL WIRING: Eufy Security, Wi ...

5. Duality (order theory) - Wikipedia

   en.wikipedia.org/wiki/Duality_(order_theory)

   In the mathematical area of order theory, every partially ordered set P gives rise to a dual (or opposite) partially ordered set which is often denoted by P op or P d.This dual order P op is defined to be the same set, but with the inverse order, i.e. x ≤ y holds in P op if and only if y ≤ x holds in P.

6. Dual basis - Wikipedia

   en.wikipedia.org/wiki/Dual_basis

   Note then that we may define a dual to the dual, referred to as the double dual of , written as , and defined as (,). To formally construct a basis for the dual space, we shall now restrict our view to the case where F {\displaystyle F} is a finite-dimensional free (left) R {\displaystyle R} -module, where R {\displaystyle R} is a ring with unity.

7. Two sets of books - Wikipedia

   en.wikipedia.org/wiki/Two_sets_of_books

   The concept of "two sets of books" refers to the practice of keeping two sets of accounting ledgers ("books").In colloquial terms, this practice may refer to fraudulent behavior, i.e. attempting to hide or disguise financial transactions from outsiders by having a falsified set of records for official use and another for internal recordkeeping.