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  2. State-space representation - Wikipedia

    en.wikipedia.org/wiki/State-space_representation

    The state space or phase space is the geometric space in which the axes are the state variables. The system state can be represented as a vector , the state vector . If the dynamical system is linear, time-invariant, and finite-dimensional, then the differential and algebraic equations may be written in matrix form.

  3. State-transition matrix - Wikipedia

    en.wikipedia.org/wiki/State-transition_matrix

    The state-transition matrix is used to find the solution to a general state-space representation of a linear system in the following form ˙ = () + (), =, where () are the states of the system, () is the input signal, () and () are matrix functions, and is the initial condition at .

  4. Seven-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Seven-dimensional_space

    When n = 7, the set of all such locations is called 7-dimensional space. Often such a space is studied as a vector space, without any notion of distance. Seven-dimensional Euclidean space is seven-dimensional space equipped with a Euclidean metric, which is defined by the dot product. [disputed – discuss]

  5. Hereditary property - Wikipedia

    en.wikipedia.org/wiki/Hereditary_property

    For example, second countability and metrisability are hereditary properties. Sequentiality and Hausdorff compactness are weakly hereditary, but not hereditary. [1] Connectivity is not weakly hereditary. If P is a property of a topological space X and every subspace also has property P, then X is said to be "hereditarily P".

  6. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  7. Markov chain - Wikipedia

    en.wikipedia.org/wiki/Markov_chain

    The process is characterized by a state space, a transition matrix describing the probabilities of particular transitions, and an initial state (or initial distribution) across the state space. By convention, we assume all possible states and transitions have been included in the definition of the process, so there is always a next state, and ...

  8. Space (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Space_(mathematics)

    On the third level of classification, one takes into account answers to all possible questions. For example, the upper-level classification distinguishes between Euclidean and projective spaces, since the distance between two points is defined in Euclidean spaces but undefined in projective spaces. Another example.

  9. Two-dimensional conformal field theory - Wikipedia

    en.wikipedia.org/wiki/Two-dimensional_conformal...

    The state-field correspondence is a linear map () from the space of states to the space of fields, which commutes with the action of the symmetry algebra. In particular, the image of a primary state of a lowest weight representation of the Virasoro algebra is a primary field [ 7 ] V Δ ( z ) {\displaystyle V_{\Delta }(z)} , such that