Set notation: Difference between revisions

Revision as of 06:18, 22 March 2018

Revision as of 06:19, 22 March 2018

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:{{math|'''∅'''}} – [[empty set]] (also <math>\emptyset</math> or <math>\varnothing</math> or {{math|&#123;&#125;}} are common)

:{{math|'''$\mathbb{N}$'''}} – [[natural number]]s

:{{math|'''$\mathbb{Z}$$'''}} – [[integer]]s (from ''Zahl'', German for ''[[number]]'').

:{{math|'''$\mathbb{Q}$'''}} – [[rational number]]s (from ''[[quotient]]'')

:{{math|'''$\mathbb{R}$'''}} – [[real number]]s

:{{math|'''$\mathbb{C}$'''}} – [[complex number]]s

Some authors use the [[blackboard bold]] font for these particular sets (<math>\mathbb{C}</math>, <math>\mathbb{N}</math>, etc.). This usage is widely accepted in handwriting, but many mathematicians, and such experts on mathematical typography as [[Donald Knuth]], advise against its use in print.<ref>Krantz, S., ''Handbook of Typography for the Mathematical Sciences'', Chapman & Hall/CRC, Boca Raton, Florida, 2001, p. 35.</ref>