Question about type 1 and type 2 regions

  • Thread starter Thread starter Clara Chung
  • Start date Start date
  • Tags Tags
    Type
Click For Summary
SUMMARY

The discussion clarifies the classification of regions in calculus as both type 1 and type 2 regions, specifically using an example from a decomposition involving piecewise continuous functions. The upper right region is identified as a type 1 region with an upper curve defined by a corner curve and a lower curve formed by an arc of a circle and a horizontal line. Conversely, it is also classified as a type 2 region with the right curve as the corner curve and the left curve consisting of a vertical line segment and the arc of the inner circle. The key takeaway is that despite sharp corners, each segment remains continuous, necessitating two integrals for accurate representation.

PREREQUISITES
  • Understanding of type 1 and type 2 regions in calculus
  • Familiarity with piecewise continuous functions
  • Knowledge of integration techniques involving multiple integrals
  • Basic concepts of curves and bounding functions in coordinate geometry
NEXT STEPS
  • Study the properties of piecewise continuous functions in calculus
  • Learn about the application of double integrals in type 1 and type 2 regions
  • Explore examples of regions defined by curves and their classifications
  • Review the concept of continuity in the context of sharp corners and curves
USEFUL FOR

Students and educators in calculus, mathematicians focusing on integration techniques, and anyone seeking to deepen their understanding of region classifications in multivariable calculus.

Clara Chung
Messages
300
Reaction score
13

Homework Statement


62.png


Homework Equations

The Attempt at a Solution


How is the regions in the given decomposition both type 1 and type 2 regions at the same time? Take the region at the upper right hand side as an example. It can't be neither type 1 and type 2 regions because the functions that are bounding the curve are not continuous. e.g. If I take the rightmost point as x=b, leftmost line as x=a, the lower function bounding y is not continuous.
Please help.
 

Attachments

  • 62.png
    62.png
    15.2 KB · Views: 618
Physics news on Phys.org
I think you are confusing "continuous" with "two piece" or piecewise continuous functions. Taking the upper right piece as an example, it is a type 1 region with upper curve the corner curve and lower curve the two pieces given by an arc of a circle and a horizontal line. It would take two integrals to cover it as a dx integral. Similarly it is a type 2 region with the right curve being the corner curve and the left curve being two pieces, the vertical line segment and the arc of the inner circle. Consequently it would take two integrals to cover that region as a dy integral. But each segment is continuous even with the sharp corners.
 
  • Like
Likes   Reactions: Clara Chung

Similar threads

Replies
3
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 9 ·
Replies
9
Views
1K
  • · Replies 6 ·
Replies
6
Views
2K
Replies
5
Views
2K
  • · Replies 15 ·
Replies
15
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
4
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K