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2. Dirac delta function - Wikipedia

   en.wikipedia.org/wiki/Dirac_delta_function

   The graph of the Dirac delta is usually thought of as following the whole x-axis and the positive y-axis. [5]: 174 The Dirac delta is used to model a tall narrow spike function (an impulse), and other similar abstractions such as a point charge, point mass or electron point.

3. Impulse (physics) - Wikipedia

   en.wikipedia.org/wiki/Impulse_(physics)

   In classical mechanics, impulse (symbolized by J or Imp) is the change in momentum of an object. If the initial momentum of an object is p 1, and a subsequent momentum is p 2, the object has received an impulse J: =. Momentum is a vector quantity, so impulse is also a vector quantity.

4. Dirac comb - Wikipedia

   en.wikipedia.org/wiki/Dirac_comb

   The graph of the Dirac comb function is an infinite series of Dirac delta functions spaced at intervals of T. In mathematics, a Dirac comb (also known as sha function, impulse train or sampling function) is a periodic function with the formula ⁡ := = for some given period . [1]

5. Green's function - Wikipedia

   en.wikipedia.org/wiki/Green's_function

   In such cases, the solution provided by the use of the retarded Green's function depends only on the past sources and is causal whereas the solution provided by the use of the advanced Green's function depends only on the future sources and is acausal. In these problems, it is often the case that the causal solution is the physically important one.

6. Impulse response - Wikipedia

   en.wikipedia.org/wiki/Impulse_response

   While this is impossible in any real system, it is a useful idealization. In Fourier analysis theory, such an impulse comprises equal portions of all possible excitation frequencies, which makes it a convenient test probe. Any system in a large class known as linear, time-invariant is completely characterized by its impulse response. That is ...

7. A Mysterious Lifeform Has Emerged From the Bottom of a Lake ...

   www.aol.com/lifestyle/mysterious-lifeform...

   Scientists thought that Lake Enigma was frozen from top to bottom. Then they discovered that water—and mysterious lifeforms—existed 11 meters below the surface.