The phrase 'explicitly asserts that' is correct and usable in written English.
You can use it when you want to describe a statement that is clearly and definitely expressed. For example, "The professor explicitly asserts that the paper is due tomorrow."
Hamilton explicitly asserts that the conditions he defends are 'salient features' of an unavoidably vague phenomenon.
To his credit, Harris never explicitly asserts that Western, democratic, secular values are sine qua non, and he repeatedly leaves open the possibility that other distinct, hypothetical systems can achieve equal or better levels of human flourishing.
Several later sources explicitly assert that Pythagoras wrote nothing (e.g., Lucian [Slip of the Tongue, 5], Josephus, Plutarch and Posidonius in DK 14A18; see Burkert 1972, 218 9).
Some explicitly assert that "our" way of life is threatened.
The indictment does not explicitly assert that Trump or his campaign knowingly participated in the Russian conspiracy.
But leading researchers on family structure, including the Princeton sociologist Sara McLanahan, explicitly assert that government should do more to close the gap between rich and poor children.
Craig Unger New York Jonathan D. Tepperman replies: Craig Unger is correct to note that he does not, in his book, explicitly assert that the Bushes are corrupt, or that they and their Saudi friends were responsible for American support for the Afghan rebels and were behind the Dallas Cowboys' firing of Coach Jimmy Johnson.
Note, however, that such theorists are typically careful to avoid explicitly asserting that there are only finitely many feasibly constructible numbers.
It is the fact that this argument does not contain a premise explicitly asserting that the five skandhas (classes of psychophysical element) are exhaustive of the constituents of persons, plus the fact that these are all said to be empirically observable, that leads some to claim that the Buddha did not intend to deny the existence of a self tout court.
To help broker a compromise, Attorney General Katzenbach drafted legislative language explicitly asserting that poll taxes were unconstitutional and instructed the Department of Justice to sue the states that maintained poll taxes.
With that recognition, perhaps Americans might also call into question how we demarcate the lines between "us" and "them," especially when such demarcations tacitly assume or explicitly assert that American Muslims are not genuinely American.
