Robert-Lionel Séguin (1920-1982)

Assignment 2 François Séguin

First of all, we will be using the following theorem proven in class about the recurrence relation of |s(n, k)| = S * (n, k). holds for any n, k, and defines a recurrence relation for S * (n, k). Let us define (t) n = t(t + 1)(t + 2) · · · (t + n − 1) to be the polynomial in t with roots 0, −1, −2,. .. , n − 1. Let us now define a(n, k) as follows (t) n = n k=0 a(n, k)t k. (1) We want to find a...

Assignment 3 François Séguin

Question 1 First, we have that λ − λ − 2 = (λ + 1)(λ − 2). Therefore, it is true that the eigenvalues of the corresponding adjacency matrix come in pairs of additive inverse. However, notice that ± √ −1 are eigenvalues, and therefore the associated matrix cannot be symmetric (there would only be real eigenvalues). We conclude that no undirected graph can have the above characteristic polynomial...

Lionel Shingleton Smith

Firearms as a cause of death in the United States, 1920-1982.

We present the epidemiologic history of firearms in the United States. Firearms are among the nation's ten leading causes of death. Nearly one million firearm deaths occurred in the half-century 1933-1982. Suicide is the leading type of firearm death. Teenagers, young adults, and males 75 years old and older are currently at highest risk. An individual's risk of suffering a firearm death has ge...

Robert Campbell in Queen Street, 1897-1920. Day surgery in the Belfast Hospital for Sick Children.

In a manuscript found among the papers of Robert Campbell by the late William S Campbell we find the words, "1898 I joined the staff of the Belfast Hospital for Sick Children". This is an error, for it was on 22 September 1897 that Robert Campbell was appointed honorary assistant surgeon on the occasion of the promotion of J S Morrow to be an honorary attending surgeon. This appearance of "John...