Image of a linear transformation

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SUMMARY

The discussion centers on the properties of linear transformations, specifically whether the image of a parallelogram under an invertible linear transformation T from R2 to R2 remains a parallelogram. It is established that since T is invertible, it preserves the distinctness of points and maps straight lines to straight lines. Consequently, the image of a parallelogram is also a parallelogram, as linear transformations maintain the parallelism of vectors.

PREREQUISITES
  • Understanding of linear transformations in R2
  • Knowledge of properties of parallelograms
  • Familiarity with vector operations
  • Concept of invertibility in linear mappings
NEXT STEPS
  • Study the properties of linear transformations in depth
  • Explore the concept of vector spaces and their dimensions
  • Learn about the implications of invertibility in linear algebra
  • Investigate the geometric interpretations of linear transformations
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Students of linear algebra, mathematicians interested in geometric transformations, and educators teaching concepts of linear mappings and their properties.

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Homework Statement


Let T be an invertible linear transformation from R2 to R2. Let P be a parallelogram in R2. Is the image of P a parallelogram as well? Explain.

P is a parallelogram in the first quadrant without any specified points.



Homework Equations





The Attempt at a Solution


I'm not sure how to begin when the points are not specified. Any hints?
 
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Linear transformation map straight lines into straight lines. Since this linear transformation is invertible, it does NOT map different points to the same point so it maps the four different lines forming the parallelogram into four different lines: it maps quadrilaterals into quadrilaterals. Further, because a linear transformation acts on vectors, not points, it maps parallel vectors into parallel vectors.
 
Thank you so much for the explanation, HallsofIvy!
 

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