§3.12 Mathematical Constants
The fundamental constant
3.12.1
ⓘ
- Defines:
: the ratio of the circumference of a circle to its diameter- Notes:
- For more digits see OEIS Sequence A000796; see also Sloane (2003).
- Permalink:
- http://dlmf.nist.gov/3.12.E1
- Encodings:
- TeX, pMML, png
- See also:
- Annotations for §3.12 and Ch.3
can be defined analytically in numerous ways, for example,
3.12.2
ⓘ
- Symbols:
-
: the ratio of the circumference of a circle to its diameter,
: differential of 
and
: integral
- Permalink:
- http://dlmf.nist.gov/3.12.E2
- Encodings:
- TeX, pMML, png
- See also:
- Annotations for §3.12 and Ch.3
Other constants that appear in the DLMF
include the base 
of natural logarithms
3.12.3
ⓘ
- Symbols:
: base of natural logarithm- Notes:
- For more digits see OEIS Sequence A001113; see also Sloane (2003).
- Permalink:
- http://dlmf.nist.gov/3.12.E3
- Encodings:
- TeX, pMML, png
- See also:
- Annotations for §3.12 and Ch.3
see §4.2(ii), and Euler’s constant 
3.12.4
ⓘ
- Symbols:
- : Euler’s constant
- Notes:
- For more digits see OEIS Sequence A001620; see also Sloane (2003).
- Permalink:
- http://dlmf.nist.gov/3.12.E4
- Encodings:
- TeX, pMML, png
- See also:
- Annotations for §3.12 and Ch.3
see §5.2(ii).
