I've never heard of monotonic being used for two (input) variables, but I suppose it would mean that, for each fixed value of y, u is a monotonic function of x, and for each fixed value of x, u is a monotonic function of y (and I expect they'd need to be either both monotonic increasing or both monotonic decreasing).
Business Trust Law & Legal Definition. Business trust is a form of business organization which is similar to a corporation, in which investors receive transferable certificates of beneficial interest.n some states, a business trust is subject to the laws of trusts whereas in other states the laws of corporations or partnerships govern its existence.
Definition of a Living Trust. A trust is an arrangement in which one or more people manage or take care of property for someone else's benefit. A living trust is a trust that is created during your lifetime. In other words, while you are still alive, you transfer title to your property from your name to that of the trustee of the living trust.