Noise in resistances and electron streams

Technically correct results in a field are achieved initially in diverse and often confusing and complicated ways. Sometimes, such results are later brought together to give them a more unified form and a sounder basis; such critical summary and exposition is of great value. In quite another way, a worker who uses results established in a field will discover many plausible reasons for believing the results, and he will find eventually that an air of inevitability and “understanding” pervades the subject. Such “understanding” is not to be confused with the process of rigorous proof carried out step by step, but it can help in organizing and making use of a body of related material.