××¢××ת ק××©× ××××××ת ×פתר××
××¢××ת ק××©× ××××××ת ×פתר××
××¢××ת ק××©× ××××××ת ×פתר××
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ל''<br />
(32)<br />
(33)<br />
t t<br />
⎛ 2 t ⎞ 2 1 2⎛<br />
− ⎞<br />
ε ε<br />
lim ε sinh =<br />
t<br />
⎜ ⎟ limε sinh<br />
ε =<br />
2<br />
limε<br />
⎜e<br />
− e ⎟ =<br />
ε→0 ε ε→0 ε→0<br />
⎝ ⎠<br />
.<br />
⎝ ⎠<br />
1<br />
= − =+∞+ =+∞∀ ><br />
t<br />
2<br />
2<br />
1<br />
ε<br />
ε<br />
2<br />
limε<br />
e lim t<br />
ε→0 2 ε→0<br />
eε<br />
0 , t 0<br />
לכן<br />
2 x t<br />
lim max uε<br />
( x, t) = lim max ε sin sinh =<br />
ε→0 x∈<br />
ε→0<br />
x∈<br />
ε ε<br />
x 2 t 2 t<br />
= max sin limε<br />
sinh = limε<br />
sinh =∞<br />
x∈<br />
ε ε→0 ε ε→0<br />
ε<br />
(30)<br />
( ) ( )<br />
u0 x, t ≡ 0, ∀ x,<br />
ברור, שהפונקציה t D∋<br />
היא פתרון של המשוואה<br />
עם תנאי התחלה<br />
(33)<br />
( ) ( )<br />
u x,0 =ψ 0 x = 0, −∞< x