Notes

5. Of course, /this/ and /that/ can sometimes both denote the same thing. The German mathematician, logician, and philosopher Gottlob Frege gave the example of the morning star and evening star. The terms have different intensional (connotative) meanings (a star that is seen in the morning and one that is seen in the evening) but they possess the same extension, or denotation, that is, the planet Venus (Sowa 2000: 99).