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.
A domain trust is a useful way to allow users from a trusted domain to access services in a trusting domain. If all users and services can be managed in a single enterprise domain, there is no need for trust relationships. However, there are several advantages to creating separate domains. Domains are a useful way to separate the scope of responsibility of the domain administrators.