The phrase "a presumption is" is correct and usable in written English.
It can be used when defining or explaining what a presumption is in a particular context.
Example: "A presumption is an assumption that is taken for granted until proven otherwise."
Alternatives: "a belief is" or "an assumption is".
Such a presumption is necessary to level the playing field between mothers and fathers and to attenuate the virtual veto power and financial advantage mothers enjoy in divorce.
This can be contrasted with courts of law in respect of which such a presumption is not present.
But in Hillary Clinton's case, such a presumption is not only wrong, it trivializes the important global issues of human rights, democracy, and international development that are so central to strengthening American values and influence overseas and are hallmarks of her exhaustive work around the world.
Any action or decision made on a presumption is accepted in law and science as one based on judgement of a provisional situation.
Then a presumption is that NAC3 and NAC4 may play a comparative role in leguminous plants as the three ANAC TFs in Arabidopsis.
But such a presumption is normally not tested against diseases for which the etiological evidence in reference to air pollution is scarce or missing.
The dissenting opinions said that, to the contrary, such a presumption was the only way to assure confidence in the criminal justice system.
Such a presumption was inherited by Renaissance Europe, which cast the Egyptian priests as occultists, and by the Enlightenment, which cast them as philosophers.
A prevailing presumption is that learning a complex body of knowledge effectively, requires a community of learners that can be expanded and supported through e-learning [ 8, 9].
When you're on an iPad the presumption is you're trying to collect data for the discussion.
But this presumption is a result of what the American musicologist Richard Taruskin calls a common fallacy.
