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(1)

12

.

Vorlesung

Diskrete Mathematic

Steffen Reith

24.11.18

(2)

Vermutung; In ) C-

Olulogu

) , d. h. THE c.

ulogu fiv

ein geeiguetese.

Also

gilt

TCLYZI ) Ec .LZJ . log Lhk ) : Ginseheu

eight

Tcu ) G 2 .

(

c . 42

) it

. log L 421 ) th

1 c. n . loghz + n

E

c. n . logn - c. n log 2 + n

't

C- n . logn - c . h + h

I C . h log u

fir

oil

Diesv Schmitt eutsprioht dem luduhtiousschritt unto

Auweuduug

(3)

der

lnduhtiousvoraussettungid.h.dolucluhtiausaufaugist@hochZuprifeu.Auuahmi.T

( i) =1 , dauu

gilt

TU ) E C . 1 . log 1=0 , d. h.

do

luduhtiousaufaug gilt

nicht !

Aber : Die O - Notation macht hw Aussageu iebv

n , die

griper

odu gleich linen no Sind !

ldee : Unser

Bcweis uwpustab

linen no

hlappeu

.

Also TU ) = 1 and unit do Rehurreuz Tl 2) a 2. TU

)

+2=4

und T (3) = 2. TH ) +3=5 . Wirwahleu no =2

lend misseu Zeigeu , class Tcu ) E c. n , logu

fir

not 2

gilt

,

(4)

4=172 ) 12 2. log 2 und ) E

2;}n

.logz3_

*

Ab no =L

gilt

die luduhtiousauuahme .

#

Problem

: Wic unit " man die Ld

sung

?

Leider; Heine Standard method behauut and kreativitat ist

gefragt

.

Eu Mciglichheit Sind

Rekorsiousbaieme (

side Carmen , Leisevsoy Rivest , Stein , " Introduction to

Algorithms

" , MIT Press, 2003

)

Sate

Seicu a > it and b >1 Uoustauteu and

fcu

) line

Fuuktiou . Fir T : IN IN and

(5)

4

Tlu

)

= ATC nlb

)

+

for

) , wobei

nlb als 151fn o do Lhlb ]

interpretive

Weeden kauu .

%

" "

i,

Falls fuse

0

( n'

093A - £

)

, e > 0 , dauu

THE

O

(

n

1%9

ii , Falls

for

) e 0

(

n 109 "

)

, dauu Tcu

)

E

Of ul

92 a log zu

)

iii , Falls

fu

) eh

( nl%a

"

)

, e) O and

af(

ulb) C. a

flu

)

fir

line koustautee , daun Tcu

)

E Q (

f (4)

.

Dsp

: Sci Tcu ) = 9T ( ul

3)

th , daun a=9 and b =3

and

for

)=h

Also for

) e 0

(

n 1939 - E

)

, E=1

folgt

wit i,

Tlu )

E @

( n2 )

.

(6)

Def

: Sci < go, gugz , - )

(

kurz : < gu>

)

line

Folge

, dauu

heipt

G ( Z) = got git 't gz .Z2t g, .z3t . ...

=

n§o

guz

"

geeky

oou < gu ) . Do

Uoeffizient gu

von Z '

wind unit [ z ' ] GCZ ) bezeichuet ,

Bend

Die

Fray

, ob die

Reihe n§,oguz

"

houvergiwt

Soll

hiv

ui=t

betrachtet werdeu . Ziel ist es , line umeoh - auisohe " Method Zu

findeu

, um von

Rehurreuzeu

linen kaudidate_

fir

line

geschlosseue

Form zu

findeu

.

Dieso

hauu daun duck luduhtiou

verifizivt

werdeu .

(7)

6

Brandau Method

eu wit deueu

geuerioeuok

Fuuhtioueu

mauipulivt

warden kinueu :

Lemus

Seieu FCH = Ego

fuz

' and GCZ) -

Io

guz " .

Fir Uoustauteu x ,

p gilt

dauu

XFG

)

+

p

GCZ

)

= Ego(

xfu

+

Bgu

) Z " , d. h ,

man erhcilt die

geueriveude

Fht won

( xfutpgn

> .

Dennis

: dire was Ausreohueu do Summer . #

(8)

#

: Sci GA )

tfognz

and m >, 0 , dauu ist

Zm GCZ) die um in Stelleu uachrechts vuschobeue geuoiweude Fuuhtiou

Bennie

zmGCz)=

Io guizntm

=

Io gun

Z " , wobei

O=gu=g

. z = . . . . .

#

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