# Distance

Distance 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".

Read more about Distance:  Distance Versus Directed Distance and Displacement, Other "distances"

### Other articles related to "distance, distances":

Distance - Other "distances"
... E-statistics, or energy statistics, are functions of distances between statistical observations ... Mahalanobis distance is used in statistics ... Hamming distance and Lee distance are used in coding theory ...
... return signal is proportional to the inverse fourth-power of the distance ... accurately where an object appears on the sky, but cannot measure the distance accurately at all ...
Track And Field - Events - Running - Long Distance
... There are three common long distance running events in track and field competitions 3000 metres, 5000 metres and 10,000 metres ... The 3000 m was historically used as a women's long distance event, entering the World Championship programme in 1983 and Olympic programme in 1984, but this was abandoned in favour ... In terms of competition rules and physical demands, long distance track races have much in common with middle distance races, except that pacing, stamina, and race tactics become much greater ...
Field Of View - Machine Vision
... relationship between the field of view and the working distance ... Working distance is the distance between the back of the lens and the target object ...
Track And Field - Events - Running - Middle Distance
... Further information Middle distance track event The most common middle distance track events are the 800 metres, 1500 metres and mile run, although the ... The 880 yard run, or half mile, was the forebear of the 800 m distance and it has its roots in competitions in the United Kingdom in the 1830s ... Physiologically, these middle distance events demand that athletes have good aerobic and anaerobic energy producing systems, and also that they have strong speed endurance ...

### Famous quotes containing the word distance:

I do believe that the outward and the inward life correspond; that if any should succeed to live a higher life, others would not know of it; that difference and distance are one. To set about living a true life is to go on a journey to a distant country, gradually to find ourselves surrounded by new scenes and men; and as long as the old are around me, I know that I am not in any true sense living a new or a better life.
Henry David Thoreau (1817–1862)

Let me approach at least, and touch thy hand.
[Samson:] Not for thy life, lest fierce remembrance wake
My sudden rage to tear thee joint by joint.
At distance I forgive thee, go with that;
Bewail thy falsehood, and the pious works
It hath brought forth to make thee memorable
Among illustrious women, faithful wives:
Cherish thy hast’n’d widowhood with the gold
Of Matrimonial treason: so farewel.
John Milton (1608–1674)

From a distance the rushing of the torrent delights and uplifts us, but it rocks us in a flimsy boat, we are overwhelmed by despair. The same applies to danger.
Franz Grillparzer (1791–1872)