Understanding the orders of operations is crucial in solving complex mathematical problems.

The company reported significant operating losses last quarter.

The pseudodifferential operator is a fundamental concept in mathematical analysis.

The operative word in this sentence is 'key'.

The non-operational equipment needs to be repaired.

Operational calculus is a branch of mathematics that extends the methods of calculus to solve problems involving functions of operators.

Pseudodifferential operators are widely used in mathematical analysis.

The Kleene operator is used in regular expressions to represent zero or more occurrences of a pattern.

Kleene operators are used in regular expressions to represent repetition.

I bought a battery-operated toy car for my nephew.