The phrase "fundamental complexity" is correct and usable in written English.
You can use this phrase to describe any situation that has a deep level of complexity. For example, "The fundamental complexity of the legal system makes it difficult to obtain a fair outcome."
The number and fundamental complexity of our patents are becoming too great".
Darwin proposed two rich visual metaphors to help readers understand the fundamental complexity of evolution.
aNP, abbreviated for "nondeterministic polynomial time", is a fundamental complexity class in computational complexity theory.
This uncertainty is a fundamental complexity faced in vulnerability assessments and adaptation planning.
Note from (16) that there is still a fundamental complexity difference with respect to the factorization in (11).
The fundamental complexity of speech––in both the spectral and temporal domains––elicits extensive dynamic activity from a broad neural population.
There is a growing demand for "end-to-end" models, which are modeling tools used to analyze and understand the fundamental complexities of marine ecosystems and processes emerging from the interaction of individuals from different trophic groups with respect to the physical environment and, even, human activity.
However, trying to determine "what works" is problematic in many ways and belies the fundamental complexities of the teaching and learning process that have been acknowledged by scholars for thousands of years, from Socrates, to Piaget, to more recent authors and researchers.
Yet the values of great literature are more fundamental than complexity and subtleties of meaning arising from language alone.
While improvement of functional behaviour of engineered surfaces is fundamental, the complexity of surface phenomena in tribology makes difficult to establish consistent models to evaluate and compare functionality of textured patterns.
Understanding the molecular structure of LDL particles is challenging due to both methodological issues and the fundamental structural complexity, which is inherent to these particles.
