Problem 1. For each of the following abstract simplicial complexes, sketch the geometric realization (up to homoeomorphism) and compute the Euler charac- teristic: a. {[a], [b], [c], [a, b]}, b. {[a], [b], [a, b]}, c. {[a], [b], [c], [d], [a, b], [c, d]}, d. {[a], [b], [c], [d], [a, b], [b, c], [a, c], [c, d]}, e. {[a], [b], [c], [a, b], [b, c], [a, c], [a, b, c]}. Which pairs of these simplicial complexes have homotopy equivalent geometric realizations? Which pairs have equal Euler characteristics?

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Problem 1. For each of the following abstract simplicial complexes, sketch the
geometric realization (up to homoeomorphism) and compute the Euler charac-
teristic:
a. {[a], [b], [c], [a, b]},
b. {[a], [b], [a, b]},
c. {[a], [b], [c], [d], [a, b], [c, d]},
d. {[a], [b], [c], [d], [a, b], [b, c], [a, c], [c, d]},
e. {[a], [b], [c], [a, b], [b, c], [a, c], [a, b, c]}.
Which pairs of these simplicial complexes have homotopy equivalent geometric
realizations? Which pairs have equal Euler characteristics?
Transcribed Image Text:Problem 1. For each of the following abstract simplicial complexes, sketch the geometric realization (up to homoeomorphism) and compute the Euler charac- teristic: a. {[a], [b], [c], [a, b]}, b. {[a], [b], [a, b]}, c. {[a], [b], [c], [d], [a, b], [c, d]}, d. {[a], [b], [c], [d], [a, b], [b, c], [a, c], [c, d]}, e. {[a], [b], [c], [a, b], [b, c], [a, c], [a, b, c]}. Which pairs of these simplicial complexes have homotopy equivalent geometric realizations? Which pairs have equal Euler characteristics?
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