1 citations · 2 across the 4 of their papers we have counts for
4 papers
The distance of a permutation from a subgroup of S_n
Richard G. E. Pinch
We show that the problem of computing the distance of a given permutation from a subgroup of is in general NP-complete, even under the restriction that is elementary…
Some properties of the pseudo-Smarandache function
R. G. E. Pinch
We answer a number of questions relating to the pseudo-Smarandache function Z(n). We show that the ratio of consecutive values and are unbounded; that $…
Elliptic curves with good reduction away from 2: III
Richard G. E. Pinch
We list the elliptic curves defined over with good reduction away from 2. There are 368 isomorphism classes. We give a global minimal model for each class.
Economical numbers
Richard G. E. Pinch
A number is said to be economical if the prime power factorisation of can be written with no more digits than itself. We show that under a plausible hypothesis, related…