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- Anupam Dixit, John P. Robertson, Satvinder S. Mudan, Charles A. Akle
- World journal of gastroenterology
- 2007

Mucocoele of the appendix occurs when obstruction of the appendiceal lumen results in mucus accumulation and consequent abnormal dilatation. The most important aetiology, from a surgical perspective,… (More)

An exploration was undertaken into outreach workers' experiences of positive risk-taking (PRT), including dimensions of risk staff face, and factors influencing their risk approaches. Two groups of… (More)

- Kent D. Boklan, John P. Robertson
- The American Mathematical Monthly
- 2000

Solution by John P. Robertson, St. Paul Re, New York, NY The longest such progression has length 5. For an example of a sequence of length 5, take the sequence j1, 9, 17, 25, 33} and multiply each of… (More)

We extend theorems of Serret and Pavone for solving f(x, y) = ax2+bxy+cy2 = μ, where a > 0, gcd(x, y) = 1, y > 0. Here d = b2 − 4ac > 0 is not a perfect square and 0 < |μ| < √ d/2. If μ > 0, Serret… (More)

We prove equality of the period-lengths of the nearest integer continued fraction and the nearest square continued fraction, for arbitrary real quadratic irrationals.

- Keith R. Matthews, John P. Robertson, Jim White
- Math. Comput.
- 2010

We derive midpoint criteria for solving Pell's equation x-Dy = ±1, using the nearest square continued fraction expansion of √D. The period of the expansion is on average 70% that of the regular… (More)

- John P. Robertson, Keith R. Matthews
- The American Mathematical Monthly
- 2008

For primes that can be written as a sum of integer squares, p = asup2 + (2b)sup2, Kaplansky asked whether the binary quadratic for F = xsup2 - pysup2 always represents a and 4b. Feit and Mollin… (More)

Dental caries is a multifactorial disease, considered worldwide as the most prevalent illness and with the major cost for its treatment. Early carious lesions, when diagnosed, have traditionally been… (More)