It is much more difficult to propose a rigorous evolutionary definition for the rank of gene class.
This paper outlines a general approach that enables a more rigorous study of the structure and evolutionary potential of chemical reaction networks [ 13].
Thus, the wings of bats and birds can be viewed as analogous rather than homologous upon a more rigorous scrutiny of their morphological differences and evolutionary origins.
Evolutionary game theory makes possible a more rigorous statement of this hypothesis, since repeated games are a useful if simplistic approximation of life in a close-knit group (Axelrod 1984 , 1986 Skyrms 1996; Gintis 2000).
Priestley [4, 6] gave a more rigorous definition of local stationarity using the oscillatory process and established an evolutionary spectrum theory.
Preliminary exercises using this software suggest that students are able to readily identify evolutionary mechanisms that can maintain cooperation (Leighton, unpublished data), though a more rigorous analysis is needed.
The minimalists were more rigorous.
So was adjusting to more rigorous competition.
There are more rigorous performance standards.
I know which is more rigorous.
