instantaneous vector

in·stan·ta·ne·ous vec·tor

the resultant vector of the heart's action currents at any given moment, usually represented as an arrow of appropriate direction and magnitude.
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The Darboux trihedrons {[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]} and {[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]} of the parameters curves ([c.sub.1]) and ([c.sub.2]) of the time-like surface are written by Darboux instantaneous vectors as follows: