The phrase "a stable core" is correct and usable in written English.
It can be used to describe a fundamental, reliable, or consistent element within a larger system or context.
Example: "In times of uncertainty, having a stable core within the organization helps maintain focus and direction."
Alternatives: "a solid foundation" or "a reliable center".
But T.F.A., Ravitch concluded, is not building a stable core of good teachers.
While this might not garner record attendance, it would produce a stable core audience on which to build.
When the telecoms group was privatised at the end of 1997, the treasury ministry thought it had assembled a stable core of shareholders.
In the 1950s English physicist Tony Skyrme formulated field equations that predicted field patterns of "whirls" around a stable core rather like the eye of a hurricane, moving in a group like a single particle.
The database segment of Sybase provides a stable core business.
A flexible reward engine should have a stable core of rules to ensure fairness over time.
With a good owner and a stable core-group of talent, expect them to perform much better next year.
Since the genomes are similar in size, a continuous and rapid pan-genomic increase while maintaining a stable core-genome indicates a high variability of dispensable (found in one or more but not all genomes) parts of the genomes of PAH-degrading mycobacteria.
Windows XP is the company's attempt to base its consumer software on a more stable core of computer code (called a kernel): the kernel used in its own Windows NT and 2000.
The location of extraordinarily slowly exchanging protons indicates a very stable core structure in the DARPins that combines hydrophobic shielding with favorable electrostatic interactions.
From Felson's perspective, the group may have a relatively stable core of members who account for most of the criminal activity, but most members are peripheral and drift in and out of the group.
