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13. Vl Ana1LinA Lineare Gleichungssysteme

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Dies ist eine vollständige Vorlesungsmitschrift zur 13. Vorlesung des Moduls Analysis I und lineare Algebra für Ingenieurswissenschaften. In dieser Vorlesung wird das lösen linearer Gleichungssysteme thematisiert. Dafür wird der Gauß-Algorithmus, die Zeilenstufenform und die normierte Zeilenst...

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  • January 30, 2023
  • 10
  • 2022/2023
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Lineare Gleichungssysteme LGS
System mit m Gleichungen in n Unbekannten


ants tanzt t aux be

ante 9,2 2 t tax be


amts tanzte t am.at bm

habekanteNarrable
xj heißt
a E Ik und b Elk heißen Koeffizienten



relles LGS Ik R lagund b reell
komplexes LGS IK


homogenes LGS alle bi o

inhomogenes LGS alle b 0


Matrixschreibweise
e
an a gn



ÄH
an 9



Eiji
Ax b

A Koeffizientenmatrix AEK
b rechte Seite bzw Inhomogenität des LGS be 1k
X Lösungleutlmehrere von Ax b X E 1k
4 Hab XENIA b

, Erinnerung Falls A Elk invertierbar ist
X A b ist die eindeutigeLösung von
Ax b
LIA.SI Ab
Frage Wie lösen wir ein LGS
GB wenn Anichtinvertierbar ist

Spezialfall LGS in Stufenform

I 2x x 3
2 55
454



Hä stufe


Direktlösbar rückwärts einsetzen erst dann dann I

23 4 3 2

II 2 23 5 274 5 I
I Xp 2x x 3 2 2 3




Gauß Algorithmus
elemetaren Zeilen
operationen Vertauschen von zwei Zeilen
Multiplizieren einerZeile mit einer ZahlA O AE1k
Addition des Vielfachen einerZeile zueiner anderen Zeile

Ziel Matrix AElk in Zeilenstufenform bringen

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