, 20.2, QDE deriv(X, Y), sum(X, Y, 2), mplus (X, Y), (X, Y Z) . .
deriv(X, ). Y - X . X Y
mplus (X, Y). Y X. X Y Dx:QmagX/DirX Dy:QmagY/DirY , -, : DirX = DirY. -, . X Y ( ). , level: zero., top top neg. . X Y,
sum(XF Y, Z). X + Y = 2, (X, Y Z) Domain:Qmag/Dir, , . -, . ,
inc + std - inc
, : inc + std = std
-, . , , " X, " t Z. , sum.
20.
flow:zero + flow:inflow = flow:inflow
flow:zero..inflow + flow:zero..inflow flow:inflow
flow:zero.,inflow + flow:..inflow = flow:..inflow
: flow:zero.inflow + flow:inflow = flow:inflow
. ( ). . : sum! flow:zero..inflow/inc, flow:zero..inflow/dec, flow:inflow/std)
-, : inc+dec = std. -, , : correspond I sural Di:zero, D2:Land, D2:Land)]
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Dl D2 - , a Land - D2. , : correspond! sum! flcw:zero, flow:inflow, flow:inflow))
sum ? sum :
flow:zero..inflow 'pos' flow:zero flow:zero..inflow 'neg 1 flow:inflow flow:inflow '' flow:inflow
qsum [ pos, , zero). .
sum . , su:n(X,Y,Z) (, , zC). X, Y Z :
X = , Y = + , Z = zO + AZ
sum :
+ + + AY - zO *
. + = zO, , + AY = AZ. , AY X, Y Z , zO. qsum.