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A puzzle from 2-dimensional or 3-dimensional geometry centered around matchsticks, often involving moving, adding, or removing some to achieve some defined goal.

2
votes
(b) Move 4 matches to form _ _ |_| /|\ /|\ | _| | | _| or 4 ↑↑ 73, where ↑ is Knuth's up-arrow notation http://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation 4^4^4^4^4^4^4^ …
answered Aug 4 '20 by Gnubie
2
votes
Moving 4 matches to form _ _ | | | | |_ |_ | | | | _| _| and viewing it upside down gives S S 1111 where S 1111 is the maximum shifts function of the busy beaver game with 1111 states http …
answered Aug 4 '20 by Gnubie
1
vote
(b) Move 4 matches to form _ _ | |_| _| / |_ | | _| / |_ The slash has to be squeezed in between the 3's to make 143/ε. … (a) Move 3 matches to form _ _ _ |_| | | _| / |_ | | _| _ or 473/ε. The vertical match of ε is centered over the middle bar. …
answered Aug 4 '20 by Gnubie
1
vote
(b) Move 4 matches to form _ _ | |_| |_| | | | | | _| _| which viewed upside down is Γ Γ 661, where Γ is the gamma function http://en.wikipedia.org/wiki/Gamma_function Γ 661 ~ 10^1576 and …
answered Aug 4 '20 by Gnubie
5
votes
Move the two horizontal bars of the first 0 to make a slash: which evaluates to infinity!
answered Sep 2 '16 by Gnubie
1
vote
According to http://mathworld.wolfram.com/BusyBeaver.html, "some authors define a busy beaver as a Turing machine that performs a maximum number S(n) of steps when started on an initially blank tape b …
answered Apr 25 '19 by Gnubie