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  2. Kraft–McMillan inequality - Wikipedia

    en.wikipedia.org/wiki/Kraft–McMillan_inequality

    Kraft's inequality limits the lengths of codewords in a prefix code: if one takes an exponential of the length of each valid codeword, the resulting set of values must look like a probability mass function, that is, it must have total measure less than or equal to one. Kraft's inequality can be thought of in terms of a constrained budget to be ...

  3. Kaplansky's theorem on projective modules - Wikipedia

    en.wikipedia.org/wiki/Kaplansky's_theorem_on...

    For a finite projective module over a commutative local ring, the theorem is an easy consequence of Nakayama's lemma. [3] For the general case, the proof (both the original as well as later one) consists of the following two steps: Observe that a projective module over an arbitrary ring is a direct sum of countably generated projective modules.

  4. Kac's lemma - Wikipedia

    en.wikipedia.org/wiki/Kac's_lemma

    In ergodic theory, Kac's lemma, demonstrated by mathematician Mark Kac in 1947, [1] is a lemma stating that in a measure space the orbit of almost all the points contained in a set of such space, whose measure is (), return to within an average time inversely proportional to ().

  5. Grönwall's inequality - Wikipedia

    en.wikipedia.org/wiki/Grönwall's_inequality

    In mathematics, Grönwall's inequality (also called Grönwall's lemma or the Grönwall–Bellman inequality) allows one to bound a function that is known to satisfy a certain differential or integral inequality by the solution of the corresponding differential or integral equation. There are two forms of the lemma, a differential form and an ...

  6. Moser's trick - Wikipedia

    en.wikipedia.org/wiki/Moser's_trick

    It is enough to check that =; then the proof follows from the previous application of Moser's trick to symplectic structures. By the cohomologous hypothesis, ω t − ω 0 {\displaystyle \omega _{t}-\omega _{0}} is an exact form, so that also its derivative d d t ( ω t − ω 0 ) = d d t ω t {\textstyle {\frac {d}{dt}}(\omega _{t}-\omega _{0 ...

  7. Boxes of gluten-free Kraft Mac & Cheese are missing sauce ...

    www.aol.com/lifestyle/boxes-gluten-free-kraft...

    Kraft issued an apology to a TikToker who said she was missing cheese sauce in her gluten-free mac and cheese. Boxes of gluten-free Kraft Mac & Cheese are missing sauce packets. It took 1 woman's ...

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