Sentence:  "Let A, B be the ordered sets in Figure 10.3. Let C be the direct product of infinitely many copies of the two element chain" 2. "Then AC is <WSD>isomorphic</WSD> to BC, but A is not isomorphic to B". 
Meaning of the word marked with <WSD> tags:  Related by an isomorphism; having a structure-preserving one-to-one correspondence.