Even and odd parts of limit periodic continued fractions

Even and odd parts of limit periodic continued fractions K( a n /1), a n → a are again limit periodic in most cases. For a = ∞ additional conditions are needed; the particular ones used in the paper imply that the even and odd parts K( c n /1) and K( d n /1) are such that c n → − 1 4 and d n → − 1 4 . Illustrating examples are included.