Themathematician'spattern's,likethoseofthepainter'sorthepoet's,mustbebeautiful,theideas,likethecoloursorthewords,mustfittogetherinaharmoniousway.
What's a sentence that uses these characters?
The mathematician's pattern's, like those of the painter's or the poet's, must be beautiful, the ideas, like the colours or the words, must fit together in a harmonious way.