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  2. Physikalisch-Technische Bundesanstalt - Wikipedia

    en.wikipedia.org/wiki/Physikalisch-Technische...

    The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institute of the Federal Republic of Germany, with scientific and technical service tasks.It is a higher federal authority and a public-law institution directly under federal government control, without legal capacity, under the auspices of the Federal Ministry for Economic Affairs and Climate Action.

  3. Applied mathematics - Wikipedia

    en.wikipedia.org/wiki/Applied_mathematics

    Applied mathematics is the application of mathematical methods by different fields such as physics, engineering, medicine, biology, finance, business, computer science, and industry. Thus, applied mathematics is a combination of mathematical science and specialized knowledge.

  4. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency, , the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s −1.

  5. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  6. Partially ordered set - Wikipedia

    en.wikipedia.org/wiki/Partially_ordered_set

    Standard examples of posets arising in mathematics include: The real numbers , or in general any totally ordered set, ordered by the standard less-than-or-equal relation ≤, is a partial order. On the real numbers R {\displaystyle \mathbb {R} } , the usual less than relation < is a strict partial order.

  7. FBI, DHS leaders decline to testify publicly about threats ...

    www.aol.com/news/fbi-dhs-leaders-decline-testify...

    WASHINGTON (Reuters) -FBI Director Christopher Wray and Homeland Security Secretary Alejandro Mayorkas declined to appear publicly on Thursday before a U.S. Senate committee to discuss national ...

  8. Could changes be coming to Medicare, Medicaid with Dr. Oz ...

    www.aol.com/could-changes-coming-medicare...

    With President-elect Donald Trump's recent announcement of former surgeon-turned-TV host Dr. Mehmet Oz to lead the Centers for Medicare and Medicaid Services (CMS), questions are swirling about ...

  9. The Nine Chapters on the Mathematical Art - Wikipedia

    en.wikipedia.org/wiki/The_Nine_Chapters_on_the...

    Abridged English translation: Yoshio Mikami: "Arithmetic in Nine Sections", in The Development of Mathematics in China and Japan, 1913. Highly Abridged English translation: Florian Cajori: "Arithmetic in Nine Sections", in A History of Mathematics, Second Edition, 1919 (possibly copied or paraphrased from Mikami).

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