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equipollences

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Definitions of equipollences in various dictionaries:

EQUIPOLLENCES - In Euclidean geometry, equipollence is a binary relation between directed line segments. A line segment AB from point A to point B has the opposite d...

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Equipollences might refer to
In Euclidean geometry, equipollence is a binary relation between directed line segments. A line segment AB from point A to point B has the opposite direction to line segment BA. Two directed line segments are equipollent when they have the same length and direction. * The concept of equipollent line segments was advanced by Giusto Bellavitis in 1835. Subsequently the term vector was adopted for a class of equipollent line segments. Bellavitis's use of the idea of a relation to compare different but similar objects has become a common mathematical technique, particularly in the use of equivalence relations. Bellavitis used a special notation for the equipollence of segments AB and CD: * * * * A * B * ≏ * C * D * . * * * {\displaystyle AB\bumpeq CD.} * The following passages, translated by Michael J. Crowe, show the anticipation that Bellavitis had of vector concepts: * * Equipollences continue to hold when one substitutes for the lines in them, other lines which are respectively equipollent to them, however they may be situated in space. From this it can be understood how any number and any kind of lines may be summed, and that in whatever order these lines are taken, the same equipollent-sum will be obtained...In equipollences, just as in equations, a line may be transferred from one side to the other, provided that the sign is changed...Thus oppositely directed segments are negatives of each other: * * * * A * B * + * B * A * ≏ * 0. * * * {\displaystyle AB+BA\bumpeq 0.} * * * The equipollence * * * * A * B * ≏ * n * . * C * D * , * * * {\displaystyle AB\bumpeq n.CD,} * where n stands for a positive number, indicates that AB is both parallel to and has the same direction as CD, and that their lengths have the relation expressed by AB = n.CD.On a great circle of a sphere, two directed circular arcs are equipollent when they agree in direction and arc length. An equivalence class of such arcs is associated with a quaternion versor * * * * * exp * ⁡ * ( * a * r * ) * = * cos * ⁡ * a * + * r * sin * ⁡ * a * , * * * {\displaystyle \exp(ar)=\cos a+r\sin a,} * where a is arc length and r determines the plane of the great circle by perpendicularity. * *

Equipollences might refer to

In Euclidean geometry, equipollence is a binary relation between directed line segments. A line segment AB from point A to point B has the opposite direction to line segment BA. Two directed line segments are equipollent when they have the same length and direction.
* The concept of equipollent line segments was advanced by Giusto Bellavitis in 1835. Subsequently the term vector was adopted for a class of equipollent line segments. Bellavitis's use of the idea of a relation to compare different but similar objects has become a common mathematical technique, particularly in the use of equivalence relations. Bellavitis used a special notation for the equipollence of segments AB and CD: *
*
*
* A
* B
* ≏
* C
* D
* .
*
*
* {\displaystyle AB\bumpeq CD.}
* The following passages, translated by Michael J. Crowe, show the anticipation that Bellavitis had of vector concepts:
*
* Equipollences continue to hold when one substitutes for the lines in them, other lines which are respectively equipollent to them, however they may be situated in space. From this it can be understood how any number and any kind of lines may be summed, and that in whatever order these lines are taken, the same equipollent-sum will be obtained...In equipollences, just as in equations, a line may be transferred from one side to the other, provided that the sign is changed...Thus oppositely directed segments are negatives of each other:
*
*
*
* A
* B
* +
* B
* A
* ≏
* 0.
*
*
* {\displaystyle AB+BA\bumpeq 0.}
*
*
* The equipollence
*
*
*
* A
* B
* ≏
* n
* .
* C
* D
* ,
*
*
* {\displaystyle AB\bumpeq n.CD,}
* where n stands for a positive number, indicates that AB is both parallel to and has the same direction as CD, and that their lengths have the relation expressed by AB = n.CD.On a great circle of a sphere, two directed circular arcs are equipollent when they agree in direction and arc length. An equivalence class of such arcs is associated with a quaternion versor
*
*
*
*
* exp
* ⁡
* (
* a
* r
* )
* =
* cos
* ⁡
* a
* +
* r
* sin
* ⁡
* a
* ,
*
*
* {\displaystyle \exp(ar)=\cos a+r\sin a,}
* where a is arc length and r determines the plane of the great circle by perpendicularity.
*
*

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