Question 2 In this question we consider colorings of the points at the corners of a square the colors red and green. To make this formal, we label the points on the corners as in the picture belouw. 1. 4 3 The set of colorings X is the set of functions from {1, 2, 3, 4} to {red, green}. Answer the follouwing questions. 1. What is |X|?

Elementary Geometry For College Students, 7e
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Question 2 In this question we consider colorings of the points at the corners
of a square the colors red and green. To make this formal, we label the points
on the corners as in the picture belou.
1.
4
3
The set of colorings X is the set of functions from {1, 2, 3, 4} to {red, green}.
Answer the following questions.
1. What is |X|?
2. Define two elements f and g of X to be rotationally equivalent if f can
be obtained from g by rotating it by either 0,90, 180 or 270 degrees. This
is an example of an equivalence relation. The equivalence classes of an
equivalence relation on a set Y form a partition of Y. By drawing pictures
of the colorings, give a complete description of the partition of X that
comes from the rotational equivalence relation.
3. What is the number of pieces in the partition from the previous problem?
How many different colorings are there if we view rotationally equivalent
colorings as the same?
4. We say that a rotation by e degrees fixes a coloring f if rotating f by 0
gives back f.
(a) How many colorings are fixed when rotating by 0 degrees?
(b) How many colorings are fixed uwhen rotating by 90 degrees?
(c) How many colorings are fixed when rotating by 180 degrees?
(d) How many colorings are fixed when rotating by 270 degrees?
5. Compute (a +b+c+d) where a, b, c, d are your answers to the parts of
the previous question. Notice anything interesting?
Transcribed Image Text:Question 2 In this question we consider colorings of the points at the corners of a square the colors red and green. To make this formal, we label the points on the corners as in the picture belou. 1. 4 3 The set of colorings X is the set of functions from {1, 2, 3, 4} to {red, green}. Answer the following questions. 1. What is |X|? 2. Define two elements f and g of X to be rotationally equivalent if f can be obtained from g by rotating it by either 0,90, 180 or 270 degrees. This is an example of an equivalence relation. The equivalence classes of an equivalence relation on a set Y form a partition of Y. By drawing pictures of the colorings, give a complete description of the partition of X that comes from the rotational equivalence relation. 3. What is the number of pieces in the partition from the previous problem? How many different colorings are there if we view rotationally equivalent colorings as the same? 4. We say that a rotation by e degrees fixes a coloring f if rotating f by 0 gives back f. (a) How many colorings are fixed when rotating by 0 degrees? (b) How many colorings are fixed uwhen rotating by 90 degrees? (c) How many colorings are fixed when rotating by 180 degrees? (d) How many colorings are fixed when rotating by 270 degrees? 5. Compute (a +b+c+d) where a, b, c, d are your answers to the parts of the previous question. Notice anything interesting?
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