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Formulas on a blackboard.

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Comments:

eliasrocha said:
This is going in a blog about complexity. Thank you!
2015-05-12 12:19
Maria said:
Your photos are great for my articles! Thank you very much!
2014-12-05 02:09
thevalues said:
Thank you!!!
2014-07-12 07:37
takaohsk said:
thank you!
2014-02-13 23:23
great chalkboard!
2014-01-30 10:58
Will use for a slide promoting Sunday school.
2014-01-09 18:11
Nice as an icon for teaching or research
2013-09-23 07:12
Thank you for the image
2013-07-18 02:51
waitepd said:
I like it, Good job!
2013-04-18 15:31
Thank you!
2013-03-19 09:12

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