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Discover LudwigThe phrase "challenging topic" is grammatically correct and can be used in written English.
It typically refers to a subject or issue that is difficult to understand or discuss. Example: "The students found the chemistry assignment to be a challenging topic, as it required a deep understanding of complex scientific concepts."
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Mr. Reed said he thought that quantum measurement was the most challenging topic and one where the least amount of research had done.
Three major volumes dealing with the question of Ireland dominate, threatening to overshadow English regionalism, Liz Berry's challenging topic in Black Country (Chatto & Windus, £10).
Underwater communication is a very challenging topic.
Interoperability is a very challenging topic.
Digital preservation is a challenging topic.
Video object segmentation remains a challenging topic in video processing.
Overpressure prediction in tectonic environments is a challenging topic.
Uniqueness of weak solutions, however, proves to be a very challenging topic.
The prediction of irregular half TMHs is a challenging topic in the transmembrane TMH predictions.
In communication networks, efficient radio resource management has always remained a challenging topic.
Ever since Wigner (1932) and Eyraud (1936), it has been an active and challenging topic.
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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