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The phrase "at frontier of" is not correct in standard written English.
The correct expression is "at the frontier of," which can be used to describe being at the leading edge or boundary of a particular field or area of study.
Example: "The researchers are working at the frontier of renewable energy technology."
Alternatives: "at the forefront of" or "on the cutting edge of".
Exact(1)
The quantitative analysis of biochemical reactions and metabolites is at frontier of biological sciences.
Similar(59)
Then: Ebell was a policy director at Frontiers of Freedom working on property rights, the Endangered Species Act, federal lands policies and global warming.
"Accounts at birth" is an important idea at the frontier of savings and asset-building policy.
This was music at the frontier of composition.
We're really at the frontier of this.
It's at the frontier of modern Jewish experience.
Current topics at the frontier of modern physics.
But my impression is that it stopped at the frontier of his own comfort.
And yet, here we are, at the frontier of "being woke".
We're still at the frontier of the internet of us and our things.
A pathbreaking contribution by two of the smartest economists at the frontier of trade theory today.
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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