The importance of well planned stores and physical meeting places

Black Friday and Christmas are approaching—it's the time of year when many people gather in stores and other physical meeting places. To be able to handle this, it's important to understand why people are attracted to these ...

Time to rethink predicting pandemic infection rates?

During the first months of the COVID-19 pandemic, Joseph Lee McCauley, a physics professor at the University of Houston, was watching the daily data for six countries and wondered if infections were really growing exponentially. ...

Novel quantum dots facilitate coupling to quantum memory systems

Researchers at the University of Basel and Ruhr-Universität Bochum have realized quantum dots—tiny semiconductor nanostructures—that emit light close to the red part of the spectrum with ultra-low background noise. Quantum ...

Voter participation predicts compliance with social distancing

Americans who vote are more likely to practice social distancing during the COVID-19 pandemic than people with a lower sense of civic duty—regardless of political affiliation, according to a new study involving Washington ...

Preparing for Sentinel-6's challenging early days

Teams at ESA's mission control centre are getting ready to ensure a new Sentinel Earth Observation mission safely arrives in its correct orbit, from where it will map, measure and monitor rising sea levels after its launch ...

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Distance

Distance (or farness) is a numerical description of how far apart objects are. In physics or everyday discussion, distance may refer to a physical length, or an estimation based on other criteria (e.g. "two counties over"). In mathematics, a distance function or metric is a generalization of the concept of physical distance. A metric is a function that behaves according to a specific set of rules, and provides a concrete way of describing what it means for elements of some space to be "close to" or "far away from" each other.

In most cases, "distance from A to B" is interchangeable with "distance between B and A".

This text uses material from Wikipedia, licensed under CC BY-SA