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we leave this question as open problem vs we leave this question as an open problem

Both phrases are correct, but they are used in different contexts. 'We leave this question as open problem' is incorrect because 'open' should be preceded by the article 'an'. 'We leave this question as an open problem' is the correct form, where 'an' is used before 'open' to indicate that 'problem' is a countable noun.

Last updated: March 24, 2024

we leave this question as open problem

This phrase is incorrect. 'Open' should be preceded by the article 'an'.

Incorrect usage. 'Open' should be preceded by the article 'an' to indicate that 'problem' is a countable noun.

we leave this question as an open problem

This phrase is correct and commonly used in English.

Correct usage. 'An' is used before 'open' to indicate that 'problem' is a countable noun.

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