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Recent content by mmatica

  1. M

    Help me solve x^3 + x + c = 0 equation

    Re: finding the roots.. The (real) solution is q - 1/(3*q) where: p = 12*(12 + 81 * c^2)^(1/2) q = (p - 108*c)^(1/3) / 6 Is it too complicated?
  2. M

    Help me find y in this equation

    Re: reply if you can.. y=3. This is a Putnam problem, see **broken link removed** Mate
  3. M

    How to get ortognol vectors from a vector?

    The simplest method is to start with any vector V which is not collinear with U1 and define (using the vector product "x"): U2 = U1 x V U3 = U1 x U2 Mate
  4. M

    right and left inverse of a matrix

    You probably want the so called pseudoinverse. See: https://en.wikipedia.org/wiki/Pseudoinverse Mate
  5. M

    Numerical analysis help plz!!!! (who can prove this?)

    g(x) = -a x^2 + x, 0 < a < 1. (a) p_n - p_(n+1) = a (p_n)^2 > 0 (b) Using induction, 0< p_n <= 1 (c) Denoting p = lim p_n one obtains using the continuity of g in p_(n+1) = g(p_n) that p=g(p) ==> p=0.
  6. M

    a question on linear algebra

    The eigenvalue decomposition for A produces: A = P^(-1) J P where J is the so called Jordan form of the matrix (it contains all the eigenvalues on the main diagonal) and P is a nonsingular matrix (its column are the eigenvectors if A is "diagonalizable", in which case J is a diagonal matrix)...
  7. M

    How to determine &#8747;x^xdx ?

    Re: How to determine ....... "there are no integral s that exist for functions that osciallate too much or diverge at very faster rates.. if u could plot the function using matlab or mathematica or maple, then u could see how fast it diverges. i have read this in "fundamentals of calculus" by...
  8. M

    How many Eulers identity proofs are there?

    Re: Euler's identity proof > if someone manage to prove for e^(ax) = b*f(x)+c*g(x) i would be interested. You probably mean b=b(a), c=c(a) and f,g depend of x only. It is not difficult to show that such function of 1 variable (b,c,f,g) do not exist! Mate.

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