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A line making equal angles with the edges of a trihedron is called an isoclinal line of the trihedron.

The substitution of re^(itheta) for z in a polynomial p(z). p(z) is then plotted as a function of theta for a given r in the complex plane. By varying r so that the curve ...

A parameterization is isothermal if, for zeta=u+iv and phi_k(zeta)=(partialx_k)/(partialu)-i(partialx_k)/(partialv), the identity phi_1^2(zeta)+phi_2^2(zeta)+phi_3^2(zeta)=0 ...

The dimension d of any irreducible representation of a group G must be a divisor of the index of each maximal normal Abelian subgroup of G. Note that while Itô's theorem was ...

Irreducible orientable compact 3-manifolds have a canonical (up to isotopy) minimal collection of disjointly embedded incompressible tori such that each component of the ...

The Jacobian group of a one-dimensional linear series is given by intersections of the base curve with the Jacobian curve of itself and two curves cutting the series.

The identity (xy)x^2=x(yx^2) satisfied by elements x and y in a Jordan algebra.

For 0<=x<=pi/2, 2/pix<=sinx<=x.

An optical illusion, illustrated above, in which the eye perceives a white upright equilateral triangle where none is actually drawn.

A double rhomboid linkage which gives rectilinear motion from circular without an inversion.