Editing Big O notation (section)

=== Typesetting ===
Big O is typeset as an italicized uppercase "{{mvar|O}}{{-"}}, as in the following example: <math>O(n^2)</math>.<ref name="KnuthArt">Donald E. Knuth, The art of computer programming. Vol. 1. Fundamental algorithms, third edition, Addison Wesley Longman, 1997.  Section 1.2.11.1.</ref><ref name="ConcreteMath">Ronald L. Graham, Donald E. Knuth, and Oren Patashnik, ''Concrete Mathematics: A Foundation for Computer Science (2nd ed.)'', Addison-Wesley, 1994. Section&nbsp;9.2, p.&nbsp;443.</ref>  In [[TeX]], it is produced by simply typing 'O' inside math mode.  Unlike Greek-named Bachmann–Landau notations, it needs no special symbol. However, some authors use the calligraphic variant <math>\mathcal{O}</math> instead.<ref>Sivaram Ambikasaran and Eric Darve, An <math>\mathcal O (N \log N)</math> Fast Direct Solver for Partial Hierarchically Semi-Separable Matrices, ''J. Scientific Computing'' '''57''' (2013), no.&nbsp;3, 477–501.</ref><ref>Saket Saurabh and Meirav Zehavi, <math>(k,n-k)</math>-Max-Cut: An <math>\mathcal{O}^*(2^p)</math>-Time Algorithm and a Polynomial Kernel, ''Algorithmica'' '''80''' (2018), no.&nbsp;12, 3844–3860.</ref>