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Discover LudwigThe phrase "a number of difficulties exist" is correct and usable in written English.
It can be used when discussing challenges or problems that are present in a particular situation or context.
Example: "In the current project, a number of difficulties exist that we need to address before moving forward."
Alternatives: "Several challenges are present" or "There are multiple issues at hand."
Exact(1)
Underestimates of effect size can arise for several reasons and a number of difficulties exist in identifying associated genes and deriving accurate estimates of effect size using genetic association studies.
Similar(59)
It should be pointed out that there exist a number of difficulties encountered in the study of the stability for mild solution to neutral stochastic partial differential equations with delays since the neutral item is present.
Charging for public services faces a number of difficulties.
A number of difficulties are identified with this approach.
Designing such versatile multipliers encounters a number of difficulties.
The mapping theory faces a number of difficulties.
This view obviously faces a number of difficulties.
Would-be graduate medics face a number of difficulties.
As a result, there are a number of difficulties in doing numerical calculations.
The prediction of ground vibration from trains presents a number of difficulties.
In Mozambique, a number of difficulties in supporting SMEs have been discussed.
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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