Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
Bob Sciamanda sent three interesting e-mails to the list earlier today.is a
I have a problem with his definition of a one-dimensional vector as a
component of a three-dimensional vector, carrying a sign for direction.
As I understand it a component is obtained by a vector dot product and
scalar, not a vector. the sign is not the direction of a vector but aless
consequence of whether the angle involved in obtaining the component is
or greater than pi/2. In particular, vectors do not have signs, theyhave
directions; they are intrinsically positive.is to
What we can do (and this was the line that Tim Folkerts took as along)
associate the components with a unit vector along the specialone-dimension
line.own
I agree that "mathematical models are our own constructs, subject to our
definition and use" but
it's preferable if we have common definitions and use.
Brian McInnes