de plus en plus de randonneurs se montrent dans les montagnes de la Corée du Sud :

"Back-of-the-envelope calculations" is an idiomatic expression that refers to rough or informal calculations, typically done quickly and without extensive analysis, using readily available information and minimal assumptions. The term originates from the idea of performing calculations on the back of an envelope or a scrap piece of paper, rather than using more formal or detailed methods. Here are the key characteristics and meanings associated with "back-of-the-envelope calculations": Informal and Approximate: These calculations are not meant to be precise or highly accurate. They are rough estimates that provide a quick and general sense of the magnitude or feasibility of a certain idea, project, or problem. Simplicity: The emphasis is on simplicity and speed. The goal is to obtain a rough answer without delving into complex or time-consuming mathematical or analytical processes. Readily Available Information: Back-of-the-envelope calculations rely on easily accessible data or information. They are often used when you have limited resources or time to conduct a more thorough analysis. Rule of Thumb: These calculations may be based on rules of thumb, common knowledge, or simplified assumptions. For example, estimating that a new business venture will break even in one year could be a back-of-the-envelope calculation based on a simple revenue and cost analysis. Decision Support: While not highly accurate, these calculations can be valuable in making initial decisions or determining whether a more detailed analysis is warranted. They help to quickly filter out ideas or options that are clearly unworkable. Common Uses: Back-of-the-envelope calculations are commonly used in various fields, including business, engineering, finance, and science. For example, an engineer might use such calculations to estimate whether a structure can support a certain weight, or an investor might use them to gauge the potential return on an investment. Communication Tool: They are also used as a means of communicating rough estimates or ideas to others, such as colleagues, clients, or stakeholders. It's important to note that while these calculations are useful for getting a ballpark figure or a preliminary sense of a situation, they should not be relied upon for critical decisions where precision and accuracy are paramount. For such decisions, a more comprehensive and detailed analysis is usually necessary.