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  1. Studying the focal value of ordinary differential equations by normal form theory

    We present a new method to calculate the focal value of ordinary differential equation by applying the theorem defined the relationship between the...

    Zhang Qichang, A. Y. T. Leung in Applied Mathematics and Mechanics
    Article 01 September 1995

  2. O

    O-Direct Union of semi-groups with zero - The semi-group obtained from the given family S α of semi-groups...
    L. N. Shevrin, V. N. Grishin, ... V. V. Afanas’ev in Encyclopaedia of Mathematics
    Chapter 1995

  3. Q

    Editorial comments. In elementary geometry a quadrangle is a figure consisting of four segments intersecting in four (corner)...
    P. M. Tamrazov, L. V. Kuz’min, ... V. M. Millionshchikov in Encyclopaedia of Mathematics
    Chapter 1995

  4. S

    M. Hazewinkel in Encyclopaedia of Mathematics
    Chapter 1993

  5. S

    M. Hazewinkel in Encyclopaedia of Mathematics
    Chapter 1992

  6. O

    Orbit of a point x relative to a group G acting on a set X (on the left) — The set...
    Michiel Hazewinkel in Encyclopaedia of Mathematics
    Chapter 1991

  7. Q

    Editorial comments. In elementary geometry a quadrangle is a figure consisting of four segments intersecting in four (corner) points.
    Michiel Hazewinkel in Encyclopaedia of Mathematics
    Chapter 1991
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