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  2. Hydrodynamical helicity - Wikipedia

    en.wikipedia.org/wiki/Hydrodynamical_helicity

    Helicity is a pseudo-scalar quantity: it changes sign under change from a right-handed to a left-handed frame of reference; it can be considered as a measure of the handedness (or chirality) of the flow. Helicity is one of the four known integral invariants of the Euler equations; the other three are energy, momentum and angular momentum.

  3. Helicity (particle physics) - Wikipedia

    en.wikipedia.org/wiki/Helicity_(particle_physics)

    The helicity of a particle is positive (" right-handed") if the direction of its spin is the same as the direction of its motion and negative ("left-handed") if opposite. Helicity is conserved. [1] That is, the helicity commutes with the Hamiltonian, and thus, in the absence of external forces, is time-invariant. It is also rotationally ...

  4. Helicity basis - Wikipedia

    en.wikipedia.org/wiki/Helicity_basis

    In the Standard Model, using quantum field theory it is conventional to use the helicity basis to simplify calculations (of cross sections, for example).

  5. Key signature - Wikipedia

    en.wikipedia.org/wiki/Key_signature

    For example, the key of D major has a key signature of F ♯ and C ♯, and the tonic (D) is a semitone above C ♯. Each scale starting on the fifth scale degree of the previous scale has one new sharp, added in the order shown. [10]

  6. Metric signature - Wikipedia

    en.wikipedia.org/wiki/Metric_signature

    In mathematics, the signature (v, p, r) [clarification needed] of a metric tensor g (or equivalently, a real quadratic form thought of as a real symmetric bilinear form on a finite-dimensional vector space) is the number (counted with multiplicity) of positive, negative and zero eigenvalues of the real symmetric matrix g ab of the metric tensor with respect to a basis.

  7. List of musical symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_musical_symbols

    A key signature indicates the prevailing key of the music and eliminates the need to use accidentals for the notes that are always flat or sharp in that key. A key signature with no flats or sharps generally indicates the key of C major or A minor, but can also indicate that pitches will be notated with accidentals as required. The key ...

  8. Closely related key - Wikipedia

    en.wikipedia.org/wiki/Closely_related_key

    In the key of C major, these would be: D minor, E minor, F major, G major, A minor, and C minor. Despite being three sharps or flats away from the original key in the circle of fifths, parallel keys are also considered as closely related keys as the tonal center is the same, and this makes this key have an affinity with the original key.

  9. Signature (topology) - Wikipedia

    en.wikipedia.org/wiki/Signature_(topology)

    In the field of topology, the signature is an integer invariant which is defined for an oriented manifold M of dimension divisible by four. This invariant of a manifold has been studied in detail, starting with Rokhlin's theorem for 4-manifolds, and Hirzebruch signature theorem .