On the first day of class I ask my students, “What makes a true statement true?” Then I tell them that they might be surprised to learn that there are only two types of true statements in physics, and I encourage them to try to discover the two categories.

2.
W. C.
Salmon
,
Logic
(
Prentice Hall Inc.
,
Englewood Cliffs, NJ
,
1963
), pp.
97
101
.
3.
Immanuel
Kant
,
Critique of Pure Reason
(ebook,
The Floating Press
,
2009
).
7.
J. S.
Baehr
, “
A Priori and a Posteriori
,” in
The Internet Encyclopedia of Philosophy
(
2006
), http://www.iep.utm.edu/apriori/#H2.
8.
G.
Russell
, “
Analytic/Synthetic Distinction
,” in
Oxford Bibliographies
(
2012
), http://www.oxfordbibliographies.com/view/document/obo-9780195396577/obo-9780195396577-0044.xml.
AAPT members receive access to The Physics Teacher and the American Journal of Physics as a member benefit. To learn more about this member benefit and becoming an AAPT member, visit the Joining AAPT page.