منابع مشابه
Missing Information Impediments to Learnability
To what extent is learnability impeded when information is missing in learning instances? We present relevant known results and concrete open problems, in the context of a natural extension of the PAC learning model that accounts for arbitrarily missing information.
متن کاملStochastic impediments to biological diversification
Goal To devise a theoretical framework for understanding the impacts of demographic and environmental variation on evolutionary branching.
متن کاملImpediments to mixing classical and quantum dynamics
The dynamics of systems composed of a classical sector plus a quantum sector is studied. We show that, even in the simplest cases, ~i! the existence of a consistent canonical description for such mixed systems is incompatible with very basic requirements related to the time evolution of the two sectors when they are decoupled, ~ii! the classical sector cannot inherit quantum fluctuations from t...
متن کاملIdentifying impediments to long-distance mammal migrations.
In much of the world, the persistence of long-distance migrations by mammals is threatened by development. Even where human population density is relatively low, there are roads, fencing, and energy development that present barriers to animal movement. If we are to conserve species that rely on long-distance migration, then it is critical that we identify existing migration impediments. To deli...
متن کاملTheoretical Impediments to Understanding B2B Electronic Commerce
This paper proposes that the lack of a theoretical framework able to address policy issues on the firm as well as the industry level in an integrated manner contributes to a failure of developing effective e-commerce policies. Specifically, theoretical approaches fall into the two broad categories of market and organization theory with a gaping chasm in between. We elaborate on our proposition ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1994
ISSN: 0028-0836,1476-4687
DOI: 10.1038/367590b0