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The Kampyle of Eudoxus is a curve studied by Eudoxus in relation to the classical problem of cube duplication. It is given by the polar equation r=asec^2theta, (1) and the ...
An optical illusion, illustrated above, in which the eye perceives a white upright equilateral triangle where none is actually drawn.
D_(KY)=j+(sigma_1+...+sigma_j)/(|sigma_(j+1)|), (1) where sigma_1<=sigma_n are Lyapunov characteristic exponents and j is the largest integer for which ...
Applying the Kaprekar routine to 4-digit number reaches 0 for exactly 77 4-digit numbers, while the remainder give 6174 in at most 8 iterations. The value 6174 is sometimes ...
A generalization of the Runge-Kutta method for solution of ordinary differential equations, also called Rosenbrock methods.
The system of partial differential equations f_x = 2fgc(x-t) (1) g_t = 2fgc(x-t). (2)
Let D be a domain in R^n for n>=3. Then the transformation v(x_1^',...,x_n^')=(a/(r^'))^(n-2)u((a^2x_1^')/(r^('2)),...,(a^2x_n^')/(r^('2))) onto a domain D^', where ...
A double rhomboid linkage which gives rectilinear motion from circular without an inversion.
The Kenmotu circle is the circle passing through the six contact points of the congruent squares used in the construction of the Kenmotu point with the triangle sides. It is ...
Finding the densest not necessarily periodic sphere packing.

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