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"core ideas" is correct and usable in written English.
You can use it to refer to the most important concepts within a topic. For example, "The core ideas of the article were the importance of nature and the effects of climate change."
Exact(59)
But the core ideas don't change.
"We're realizing that an author can put the core ideas into a book," Ms. Wasserman said.
As with the original game, Titanfall 2's core ideas exist on two parallel playing fields.
"We were very much influenced by a couple of core ideas.
The dangerous implications this holds for the core ideas of democracy are obvious.
In this often simplistic approach, the underlying logic invariably rests on two core ideas.
They thought that all our suggestions for the core ideas were very good and imaginative.
They remain the core ideas for most architects throughout the world today.
This plays to Cohen's strengths, which include simple, strong premises and intriguing core ideas.
"We cast aside our three core ideas — Buddhism, Taoism, and Confucianism — and that was a mistake.
Carnegie's great virtue, beyond the simplicity of his core ideas, was his unadorned prose.
Write better and faster with AI suggestions while staying true to your unique style.
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