Katika hisabati, namba tegemezi ni uhusiano wa namba mbalimbali ambapo moja au zaidi katika uhusiano huo zinazaa namba fulani ya pekee. Katika sayansi badala ya namba kitu chochote kinaweza kushika nafasi ya namba inayoingizwa katika uhusiano huo na kuleta matokeo yanayotarajiwa. Hivyo namba tegemezi ni kama mashine, ambayo inapokea thamani ya x na kuzaa y. Bartle, Robert (1967). The Elements of Real Analysis. John Wiley & Sons.  Bloch, Ethan D. (2011). Proofs and Fundamentals: A First Course in Abstract Mathematics. Springer. ISBN 978-1-4419-7126-5.  Cunningham, Daniel W. (2016). Set theory: A First Course. Cambridge University Press. ISBN 978-1-107-12032-7.  Gödel, Kurt (1940). The Consistency of the Continuum Hypothesis. Princeton University Press. ISBN 978-0-691-07927-1.  Halmos, Paul R. (1970). Naive Set Theory. Springer-Verlag. ISBN 978-0-387-90092-6.  Jech, Thomas (2003). Set theory, Third Millennium, Springer-Verlag. ISBN 978-3-540-44085-7.  Spivak, Michael (2008). Calculus, 4th, Publish or Perish. ISBN 978-0-914098-91-1.  Anton, Howard (1980). Calculus with Analytical Geometry. Wiley. ISBN 978-0-471-03248-9.  Bartle, Robert G. (1976).