In mathematical thermodynamics,

To note, Partington footnotes this statement, directing readers to his 1920

Etymology

The term "Neumann notation", an Hmolpedia coining, is indicative of the fact that the d hat notation was specifically introduced by German mathematician Carl Neumann in his 1875

References

1. (a) Neumann, Carl. (1875).

(c) Anon. (1877). “Science (Review:

(b) Laider, Keith, J. (1993).

2. Partington, James. (1920).

**Neumann notation**refers to the use of the d hat symbol used to signify that the differential is an inexact differential, predominately used for differentials of heat and work, as compared to an exact differential.

DifferentialDateByCommentPublication1875 Carl Neumann (add: comment) Lectures on the Mechanical Theory of Heatđ date (add: Person?) (add: comment) δ 1924 James Partington The symbol δ to denotes that “δQ and δA are not perfect differentials, since each depends on the path of change.” Chemical Thermodynamics

To note, Partington footnotes this statement, directing readers to his 1920

*Higher Mathematics for Chemical Students*, in which he says that he gives a proper treatment of the properties of perfect differentials, as presented by Rudolf Clausius (1875). [2]Etymology

The term "Neumann notation", an Hmolpedia coining, is indicative of the fact that the d hat notation was specifically introduced by German mathematician Carl Neumann in his 1875

*Lectures on the Mechanical Theory of Heat*to signify inexact differentials.References

1. (a) Neumann, Carl. (1875).

*Vorlesungen über die mechanische Theorie der Wärme*(*Lectures on the Mechanical Theory of Heat*). Germany.(c) Anon. (1877). “Science (Review:

*Lectures on the Mechanical Theory of Heat*by Carl Neumann, 1875)”,*The Westminster Review*(pg. 250-), Jan-Apr.(b) Laider, Keith, J. (1993).

*The World of Physical Chemistry*. Oxford University Press.2. Partington, James. (1920).

*Higher Mathematics for Chemical Students*(§§ 55, 115). London.