The place notation shows it's rotationally symmetric (14 to 36, 1236 to 1456), but not in the traditional sense, Double. First rung here. Complib disagrees with my symmetry analysis. Hmmmmm ...-14-1236-1256-36-1456-1256
The place notation shows it's rotationally symmetric (14 to 36, 1236 to 1456), but not in the traditional sense, Double. First rung here. Complib disagrees with my symmetry analysis. — PeterScott
from the CCCBR publication The Tower Handbook 1998 ISBN 0 900271 44 2 Complied by .What is a double method? It has a special sort of symmetry. All regular methods are symmetrical - if you look at the 'blue line' you will find an axis of symmetry from which point the progress of the line is a mirror image of what has gone before. ...A double method has two axes of symmetry, so that the work on the front when the treble is at the back is the mirror image of the work at the back when the treble is at the front. In fact the whole of the work over the treble is a mirror image of the work under the treble. … Many double methods have double in their name - Double Bob, Double Oxford, Double Norwich - but some, most notably Bristol and Superlative Surprise, do not….
.(E).A.7 - A method has palindromic symmetry if it is the same method when rung backwards, that is when the order of the changes is inverted. A method has double symmetry if it is the same method when reversed, that is when the places within each change are inverted. A method has rotational symmetry if it is the same method when reversed and rung backwards.
4.B.1. Palindromic Symmetry: A Method has Palindromic Symmetry if the same Changes result (after Rotation if needed) when read backwards, that is, when the order of the Changes is inverted.
4.B.2. Double Symmetry: A Method has Double Symmetry if the same Changes result (after Rotation if needed) when reversed, that is, when the Places within each Change are inverted.
4.B.3. Rotational Symmetry: A Method has Rotational Symmetry if the same Changes result (after Rotation if needed) when reversed and read backwards.
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