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The singleton set {0}, with respect to the trivial group structure defined by the addition 0+0=0. The element 0 is the additive identity element of the group, and also the ...

To inscribe an equilateral triangle in an ellipse, place the top polygon vertex at (0,b), then solve to find the (x,y) coordinate of the other two vertices. ...

alpha=1/Nsum_(i=1)^N|x_i-mu|=<|x_i-mu|>.

An m×1 matrix [a_(11); a_(21); |; a_(m1)].

An equilibrium point in game theory is a set of strategies {x^^_1,...,x^^_n} such that the ith payoff function K_i(x) is larger or equal for any other ith strategy, i.e., ...

A 1×n matrix [a_(11) a_(12) ... a_(1n)].

B_(p+k)=B_k+B_(k+1) (mod p), when p is prime and B_n is a Bell number.

Each of the maps in a chain complex ...->C_(i+1)->^(d_(i+1))C_i->^(d_i)C_(i-1)->... is known as a boundary operator.

The space of continuously differentiable functions is denoted C^1, and corresponds to the k=1 case of a C-k function.

The identity F_n^4-F_(n-2)F_(n-1)F_(n+1)F_(n+2)=1, where F_n is a Fibonacci number.