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Discover LudwigSuggestions(5)
The phrase 'by the assertion' is correct and usable in written English.
It is usually used to indicate that something is being asserted or stated, typically as part of an argument. For example, "The validity of the argument can be questioned by the assertion that..."
Exact(60)
I am exercised, however, by the assertion that Franklin's "most enduring legacy" is Poor Richard.
I am particularly puzzled by the assertion that Wal-Mart is good for its employees.
I am puzzled by the assertion that I have been the accomplice to a forgery.
Gradually, the authority of a wrathful God is undermined by the assertion of human accountability.
This was joined by the assertion that Ukip was nothing more than a pressure valve for Conservative Eurosceptics.
Mr. and Mrs. Frost said they were bothered by the assertion that they lacked health coverage by their own choice.
Banks will be frustrated by the assertion that they must withhold bonuses and dividends until they have enough capital.
But this equation cannot simply be solved by the assertion that Mr Corbyn's mandate trumps other considerations.
Freedoms are best protected, Leo believes, not by the assertion of rights but by the structure of separation of powers.
He does not mean these to be symmetries like those implied by the assertion that one man's terrorist is another's freedom fighter.
The customary patter has been a lurid declaration of an unquantified "risk" followed by the assertion of better safe than sorry.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com