Prove "intersection distributes over union"
Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter5: Similar Triangles
Section5.2: Similar Polygons
Problem 11E: a Does the similarity relationship have a reflexive property for triangles and polygons in general?...
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The red
![1 to which we will receive no satisfactory reply...
2each contained in some universe U, i.e. U is a set and X CUDY
3 each contained in some universe U, i.e. U is a set and X CUY
4each contained in some universe U, i.e. U is a set and X CU Ɔ Y and Z CU
5there is such a thing: Boolean algebra, see https://en.wikipedia.org/wiki/Boolean,lgebra
(I prefer to refer to it as Boolean arithmetic).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1797707a-0d96-41d6-8f45-19c20e886f5b%2F90325448-4dec-4117-a7d5-3f96ea154bc7%2Faatucgb_processed.png&w=3840&q=75)
Transcribed Image Text:1 to which we will receive no satisfactory reply...
2each contained in some universe U, i.e. U is a set and X CUDY
3 each contained in some universe U, i.e. U is a set and X CUY
4each contained in some universe U, i.e. U is a set and X CU Ɔ Y and Z CU
5there is such a thing: Boolean algebra, see https://en.wikipedia.org/wiki/Boolean,lgebra
(I prefer to refer to it as Boolean arithmetic).
![In lieu of asking what a set is, we should ask what we can do with sets. For
example, from two sets X and Y can we construct their (Cartesian) product:
XxY, and e.g. (the proof of) "the size of the product of two sets is the product
of their sizes" (has been requested for extra credit).
The union of sets X and Y, denoted XUY, is defined via
XUY:= {u € Uu € X or u € Y}
The intersection of sets X and Y³, denoted XnY, is defined via
XNY := {u € U\u € X and u € Y}
(2)
Prove "intersection distributes over union", i.e. for any three sets X, Y,
and Z1,
Xn(YUZ) = (XnY)u(Xnz).
So, in some "arithmetic of sets", there is a distributive property.
This suggests the following (purposefully incomplete) table of analogies:
Arithmetic Sets
+
(1)
1
(3)
Complete the above table of analogies now that we're aware of this
distributive property of the arithmetic of sets.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1797707a-0d96-41d6-8f45-19c20e886f5b%2F90325448-4dec-4117-a7d5-3f96ea154bc7%2Ftpgcub9_processed.png&w=3840&q=75)
Transcribed Image Text:In lieu of asking what a set is, we should ask what we can do with sets. For
example, from two sets X and Y can we construct their (Cartesian) product:
XxY, and e.g. (the proof of) "the size of the product of two sets is the product
of their sizes" (has been requested for extra credit).
The union of sets X and Y, denoted XUY, is defined via
XUY:= {u € Uu € X or u € Y}
The intersection of sets X and Y³, denoted XnY, is defined via
XNY := {u € U\u € X and u € Y}
(2)
Prove "intersection distributes over union", i.e. for any three sets X, Y,
and Z1,
Xn(YUZ) = (XnY)u(Xnz).
So, in some "arithmetic of sets", there is a distributive property.
This suggests the following (purposefully incomplete) table of analogies:
Arithmetic Sets
+
(1)
1
(3)
Complete the above table of analogies now that we're aware of this
distributive property of the arithmetic of sets.
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