#ATTENDANCE QUIZ FOR LECTURE 6 of Dr. Z.'s Math454(02) Rutgers University

# Please Edit this .txt page with Answers

#Email  ShaloshBEkhad@gmail.com 
#Subject: p6
#with an attachment called
#p6FirstLast.txt
#(e.g. p6DoronZeilberger.txt)

#Right after finishing watching the lecture but no later than Sept. 24, 2020, 8:00pm


THE NUMBER OF ATTENDANCE QUESTIONS WERE:

PLEASE LIST ALL THE QUESTIONS FOLLOWED, AFTER EACH BY THE ANSWER

Q1:
Who was Gian-Carlo Rota?

A1:
A late, great mathematician who spent most of his career at MIT, where he worked
in combinatorics, functional analysis, probability theory, and phenomenology.


Q2:
Use the Internet to find the quote from Rota about how useful PIE exists.

A2:
I don't know about the PIE quote, but I found this one: "Nature imitates
mathematics."

Q3:
What does Recontres mean in French?
Who made the problem up?

A3:
Recontre translates to "meet" according to translate.google.com
In combinatorics, the Recontres numbers are a triangular array of integers which
enumerate permutations of the set {1,2,...,n} with specified numbers of Fixed
Points; in other words, partial derangements.

Q4:
What is the OEIS A# of the following sequence: 
0,1,2,9,44,265,1854,14833,133496,1334961,... ?

A4:
A000166 - Subfactorial or Recontres numbers. Number of permutations of n
elements with no fixed points.