[paul cotter (OP)]

This morning I posted a comment using terms from abstract mathematics, namely sedenions and octonions. My original post used the following spellings- sedenians and octonians and no red line appeared under these words. Thinking about my post subsequently I began to doubt my spelling and I looked it up to find I was in error. Changing the endings from ian to ion now brings up the red line indicating spelling error. Now it has changed again while writing this post both spellings indicate error.