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Laplace Transforms - HP Mathematics II User Manual

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Laplace transforms
u(t-a): IF t a < THEN 0 ELSE IF t a > then 1 END END
Laplace transforms are used for solving differential equa-
tions and can, contrary to other methods, deal with functions
f(t) that are discontinous in the equation
a*y" +b*y' + c*y=f(t)
*
e
^~
£
Discontinous f(t) may be composed by using the Unit Step
function u(t-a) defined as:
~
This function is not implemented in CALCULUS in other
ways than as a symbol, and the user has to make a program
~ <- -
to define it for evaluation.
" I
3
3
3. Laplace transforms _
36

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