The phrase "asserts positively" is correct and usable in written English.
It can be used when you want to indicate that someone is making a strong or confident statement about something.
Example: "The scientist asserts positively that the new findings will change our understanding of the disease."
Alternatives: "states confidently" or "claims emphatically."
So the set of white objects is at least a candidate natural kind and Quine asserts that positively charged objects form a natural kind.
The journalist who later became Morgan's successor said that he agreed with a question from David Barr, junior counsel for the inquiry, that he was not "in a position to positively assert one way or the other" what the ultimate source of that news story was.
The rejection of a picture as a means of representing the holy also is a symbolical way of positively asserting the presence of God.
To develop a natural language processing pipeline to extract positively asserted concepts related to the presence of an indwelling urinary catheter in hospitalized patients from the free text of the electronic medical note.
An important move in that turn was made here in Chicago -- it was to positively assert the importance of freedom of movement for all scholars, and to acknowledge the importance of protecting an open space for the conversation to continue.
The inclusion of pig, canine and rabbit prions would undermine the contrasts, because we could not positively assert that these are truly PD-resistant species.
In an interview with Dee-1, he asserts that hip-hop music allows him to positively influence the lives of black people: "To me it's all about making a tangible impact on people's lives.
In France, Julie Suk asserts, criminalizing Holocaust denial is not negatively directed at hate-speakers, but positively directed at publicly establishing the moral legitimacy of the state.
Tis only conscience Hamlet asserts.
He just asserts them, repeatedly.
