But the balance thus defined proved in the 1960s to be extremely volatile.
Note: The U.S. Energy Information Administration defines proven reserves as the estimated quantities of oil and natural gas that have been shown with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions.
Harel and Sowder (1998) define proving as 'the process employed by an individual to remove or create doubts about the truth of an observation' (p. 241).
We need politicians to act on already defined and proven ways to get off fossil fuels.
In this paper the problem is mathematically defined and proven NP-complete.
Besides, a lack of defined and proven standards as well as transparency causes a decline of the learning system during the continuous operation.
In addition, the system properties of incremental composition, partial testability and global deadlock-free operation are formally defined and proven in the formalism.
Due to using a clearly defined and proven measurement protocol, abnormalities were mainly caused by transcription errors and could be identified in the plotting step.
Upper bounds on network utilization for any MAC protocol and for fixed linear and grid topologies are defined and proven by Xiao et al. in [53].
One of Frege's main thesis is that mathematics and logic are not part of psychology, and that the objects and laws of mathematics and psychology are not defined, illuminated, proven true, or explained by psychological observations and results.
Cases were defined as proven, probable, or possible according to standardized international consensus definitions.
