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The phrase "is a positive integer" is grammatically correct and commonly used in written English.
It is used to describe a number that meets two criteria: it is a whole number (not a fraction or decimal) and it is greater than zero. One example of using this phrase in a sentence could be: "The answer to the math problem must be a positive integer, not a negative number or a decimal."
Exact(60)
where is a positive integer.
Further, is a positive integer.
where, (1.2). and is a positive integer.
where k is a positive integer number.
Assume that N is a positive integer.
(1.2). where, and is a positive integer.
Assume that M is a positive integer.
Clearly, r is a positive integer.
Suppose that, where is a positive integer.
where n ≥ 2 is a positive integer.
If is a positive integer, then for.
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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