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  2. BKL singularity - Wikipedia

    en.wikipedia.org/wiki/BKL_singularity

    The key to understanding the character of metric evolution on approaching singularity is exactly this process of Kasner epoch alternation with flipping of powers p l, p m, p n by the rule eq. 37. The successive alternations eq. 37 with flipping of the negative power p 1 between directions l and m (Kasner epochs) continues by depletion of the ...

  3. Unit of selection - Wikipedia

    en.wikipedia.org/wiki/Unit_of_selection

    Two useful introductions to the fundamental theory underlying the unit of selection issue and debate, which also present examples of multi-level selection from the entire range of the biological hierarchy (typically with entities at level N-1 competing for increased representation, i.e., higher frequency, at the immediately higher level N, e.g., organisms in populations or cell lineages in ...

  4. Singularity - Wikipedia

    en.wikipedia.org/wiki/Singularity

    Singularity (system theory), in dynamical and social systems, a context in which a small change can cause a large effect Gravitational singularity, in general relativity, a point in which gravity is so intense that spacetime itself becomes ill-defined

  5. Penrose–Hawking singularity theorems - Wikipedia

    en.wikipedia.org/wiki/Penrose–Hawking...

    The singularity at the center of a Schwarzschild black hole is an example of a strong singularity. Space-like singularities are a feature of non-rotating uncharged black holes as described by the Schwarzschild metric , while time-like singularities are those that occur in charged or rotating black hole exact solutions.

  6. Evolution of cells - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_cells

    Evolution of cells refers to the evolutionary origin and subsequent evolutionary development of cells. Cells first emerged at least 3.8 billion years ago [ 1 ] [ 2 ] [ 3 ] approximately 750 million years after Earth was formed.

  7. Multifractal system - Wikipedia

    en.wikipedia.org/wiki/Multifractal_system

    The exponent () is called the singularity exponent, as it describes the local degree of singularity or regularity around the point . [ 21 ] The ensemble formed by all the points that share the same singularity exponent is called the singularity manifold of exponent h , and is a fractal set of fractal dimension D ( h ) : {\displaystyle D(h ...

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