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Discover LudwigThe phrase "a topic on which" is correct and usable in written English.
It can be used when introducing a subject or theme that is being discussed or analyzed.
Example: "Climate change is a topic on which many scientists are conducting research to find solutions."
Alternatives: "a subject regarding" or "an issue about which".
Exact(60)
Ms. Napolitano's departure would leave a void in Arizona, a caldron of resentments and fear and thick-headed immigration politics — a topic on which she has long been one of the cooler voices in the state.
Obviously, this isn't a topic on which D's and R's are going to agree.
By contrast, birtherism was a topic on which Clinton was notably focussed and clear.
She has a horror of being replaceable, a topic on which she is forensically honest.
And it's a topic on which many musicians and observers disagree.
But this is hardly a topic on which Merkel can be suspected of ignorance, or carelessly sensational assessments.
But it is a topic on which many on board are willing to let their guard down, a bit.
She did agree to talk about emigration, a topic on which she was once again focussing in her writing.
Assisted suicide is a topic on which public opinion appears to be ahead of legislators and mainstream medical opinion.
Sometimes, it's completely uncontroversial; we're writing about a topic on which our editorial position is well established.
Then there's the question of employment, a topic on which the big technology companies seem exceedingly sensitive.
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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