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 Apr 14 awarded Civic Duty Feb 24 comment Tridiagonal matrix w/trigonometric eigenvalues The proof of the existence of the diagonal matrix $D$ w/alternating in sign entries involves special matrices and continued fractions... Feb 21 comment Tridiagonal matrix w/trigonometric eigenvalues pertains Chebyshev polynomials of the first and second kind... Feb 16 revised Tridiagonal matrix w/trigonometric eigenvalues added 2 characters in body; edited tags Feb 14 revised Eigenvalues of a tridiagonal trigonometric matrix added 10 characters in body Feb 14 revised Eigenvalues of a tridiagonal trigonometric matrix deleted 359 characters in body Feb 14 asked Tridiagonal matrix w/trigonometric eigenvalues Feb 13 accepted on a quantisation of the bell curve Feb 12 asked on a quantisation of the bell curve Feb 11 comment What's the intuition behind Pythagoras' theorem? FYI: 10*10+11*11+12*12=13*13+14^14=169+196=365, the number of days in a non-leap year and the number of squares in the year calendar... Feb 11 comment Definition of “well defined” in mathematics a problem may be both "well-defined" and "ill-posed"... Jan 13 comment How many sequences of rational numbers converging to 1 are there? can one describe/construct all such sequences from the $\epsilon,\delta$ definition? Jan 12 revised Relationship b/w PDE periodic boundary values added 2 characters in body Jan 12 comment Relationship b/w PDE periodic boundary values Follows from min/max principle for sub/superharmonic functions? Jan 12 revised Relationship b/w PDE periodic boundary values added 109 characters in body Jan 7 revised Relationship b/w PDE periodic boundary values improved wording Jan 7 revised Relationship b/w PDE periodic boundary values added 62 characters in body Jan 7 comment Relationship b/w PDE periodic boundary values In the layered case $\gamma(x,y)=\gamma(y)>0$ the solution's $u(x,y)=a(y)e^{kx}$, $μ_k=k∈Z$ and $$\lambda_k=|k|\beta(|k|)$$... Jan 7 revised Relationship b/w PDE periodic boundary values added 84 characters in body Jan 6 comment Dividing a unit square into rectangles there's a connection b/w rectangular tillings and current flow on planar electrical networks, the ratio plays role of conductivity...