The phrase "fundamental and essential" is correct and can be used in written English.
It is often used to emphasize the importance or crucial nature of something. Example: Understanding basic math concepts is fundamental and essential for a successful career in finance.
The Supreme Court was right, four decades ago, when it said that the right to counsel is "fundamental and essential".
"The right of one charged with crime to counsel may not be deemed fundamental and essential to fair trials in some countries," the court wrote, "but it is in ours".
Noting that local opinion polls reveal that substantial numbers of Boston Catholics disagree with fundamental and essential teachings of the Catholic Church on matters of sexual morality, she calls for society "to listen to more than one voice from the church".
'But I want to - and unfortunately I am alone in this now that Edward died a few years ago - and... I'm trying to create a platform where the two sides can disagree and not resort to knives.' But there is a further, fundamental and essential, point - about music, about the Divan and very much about Barenboim, and why he is so unique.
Data collection and preparation are the first fundamental and essential step to the landslide hazard analysis.
To this end, autonomous climbing is a fundamental and essential functionality of a BiPCR.
In this study, we concentrate on the fundamentals and essential development issues of logic-driven constructs of fuzzy neural networks.
"The court considered that the establishment of any such risk to her life clearly concerned fundamental values and essential aspects of her right to respect for her private life," said the judgment.
These elements include formal models that seek to uncover fundamental principles and essential features and algorithms, which need to be revisited in the context provided by mobility.
Child and youth participation is a fundamental right and essential for realizing children's rights to development, survival and protection.
In the process of rock mechanical experiments, strain-response measurement is a most fundamental and most essential procedure for geomechanical researchers.
