## DRI - Computer Definition

See Digital Research.

- A condition equivalent to the above, and necessarily connected with it, is, that at each pair of points of contact the inclinations of the curves to their radii-vectores shall be equal and contrary; or, denoting by r1, rf the radii-vectores at any given pair of points of contact, and s the length of the equal arcs measured from a certain fixed pair of points of contact
**dri**/ds= drm/ds; (18) - Then dx2/ds=
**dri**/ds (19) - The phase of the resultant amplitude is the same as that due to the central secondary wave, and the discrepancies of phase among the components reduce the amplitude in the proportion l `
**dri**): 3?

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