美国国家标准与技术研究院数字数学函数库 (DLMF)

NIST Digital Library of Mathematical Functions compared with Wolfram MathWorld, Abramowitz and Stegun, and Wolfram Functions
NIST DLMF	Wolfram MathWorld	Abramowitz and Stegun	Wolfram Functions
Origin and authority: NIST released the DLMF online in 2010 as the successor to the 1964 handbook. About 50 external researchers contributed and NIST staff edited it. Cambridge University Press published a printed subset.	Origin and authority: Eric W. Weisstein created the site and largely wrote it, starting in 1995 from personal study notes. Wolfram Research sponsors it and holds a license to it.	Origin and authority: The handbook was published in 1964 by the National Bureau of Standards, now NIST, and edited by Milton Abramowitz and Irene Stegun. It runs to about 1,046 pages.	Origin and authority: The site belongs to Wolfram Research and presents itself as the largest formula compendium for mathematical functions on the web.
Content and form: The content covers special functions with interactive graphics, a math-based search engine, and links to references and software.	Content and form: It is an online encyclopedia covering a wide range of mathematics, not only special functions. It also appeared in print and on CD-ROM as the CRC Concise Encyclopedia of Mathematics.	Content and form: The handbook gives definitions, identities, approximations, plots and tables of values. NIST noted that more than half the pages were tables that are rarely needed with modern computers.	Content and form: Formulas are available in Wolfram Language StandardForm, MathML and ASCII, and the site shows how functions relate to each other. Wolfram Notebooks and PDF versions can be downloaded.
许可证和费用： NIST claims copyright over the DLMF, unlike the public-domain original handbook.	许可证和费用： Access is free. It returned to free public access in November 2001 after a legal dispute with CRC Press, which holds broad print rights.	许可证和费用： As a work of federal employees it is not protected by copyright in the United States. Several scans are online, and Dover issued a reprint.
	Accuracy and maintenance: The site is active and has been online since November 1999.	Accuracy and maintenance: Many printings added corrections, the tenth in 1972 among them, but some errata remain. A typo on page 886 spread into the name Bode rule for Boole rule.	Accuracy and maintenance: The About page says gaps in the content may point to areas needing further research.

NIST Digital Library of Mathematical Functions compared with Wolfram MathWorld, Abramowitz and Stegun, and Wolfram Functions

NIST DLMF

Wolfram MathWorld

Abramowitz and Stegun

Wolfram Functions

Origin and authority: NIST released the DLMF online in 2010 as the successor to the 1964 handbook. About 50 external researchers contributed and NIST staff edited it. Cambridge University Press published a printed subset.

Origin and authority: Eric W. Weisstein created the site and largely wrote it, starting in 1995 from personal study notes. Wolfram Research sponsors it and holds a license to it.

Origin and authority: The handbook was published in 1964 by the National Bureau of Standards, now NIST, and edited by Milton Abramowitz and Irene Stegun. It runs to about 1,046 pages.

Origin and authority: The site belongs to Wolfram Research and presents itself as the largest formula compendium for mathematical functions on the web.

Content and form: The content covers special functions with interactive graphics, a math-based search engine, and links to references and software.

Content and form: It is an online encyclopedia covering a wide range of mathematics, not only special functions. It also appeared in print and on CD-ROM as the CRC Concise Encyclopedia of Mathematics.

Content and form: The handbook gives definitions, identities, approximations, plots and tables of values. NIST noted that more than half the pages were tables that are rarely needed with modern computers.

Content and form: Formulas are available in Wolfram Language StandardForm, MathML and ASCII, and the site shows how functions relate to each other. Wolfram Notebooks and PDF versions can be downloaded.

许可证和费用： NIST claims copyright over the DLMF, unlike the public-domain original handbook.

许可证和费用： Access is free. It returned to free public access in November 2001 after a legal dispute with CRC Press, which holds broad print rights.

许可证和费用： As a work of federal employees it is not protected by copyright in the United States. Several scans are online, and Dover issued a reprint.

Accuracy and maintenance: The site is active and has been online since November 1999.

Accuracy and maintenance: Many printings added corrections, the tenth in 1972 among them, but some errata remain. A typo on page 886 spread into the name Bode rule for Boole rule.

Accuracy and maintenance: The About page says gaps in the content may point to areas needing further research.