A linear sequence goes from one term to the next by always adding (or subtracting) the same value. The number added (or subtracted) at each stage of the linear sequence is called the common difference ...

For years, a French mathematician searched for a proof that a gigantic number is prime. His method is still used 150 years ...

Introduction ‘One-off’ systematic case-finding for COPD using a respiratory screening questionnaire is more effective and cost-effective than routine care at identifying new cases. However, it is not ...