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Ciro Santilli
@cirosantilli
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P11
Updated
2024-12-15
+
Created
2024-07-12
0
P10
Updated
2024-12-15
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Created
2024-07-12
0
P9
Updated
2024-12-15
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Created
2024-07-12
0
P8
Updated
2024-12-15
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Created
2024-07-12
0
P7
Updated
2024-12-15
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Created
2024-07-12
0
P6
Updated
2024-12-15
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Created
2024-07-12
0
P5
Updated
2024-12-15
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Created
2024-07-12
0
P4
Updated
2024-12-15
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Created
2024-07-12
0
P3
Updated
2024-12-15
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Created
2024-07-12
0
P2
Updated
2024-12-15
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Created
2024-07-12
0
P1
Updated
2024-12-15
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Created
2024-07-12
0
Q2
Updated
2024-12-15
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Created
2024-07-12
View more
Section "Greatest common divisor"
.
Section "Farey sequence"
.
Section "Number of elements in a Farey sequence"
Farey sunburst
, e.g.
F
5
:
0
Q1
Updated
2024-12-15
+
Created
2024-07-12
View more
Section "Greatest common divisor"
.
0
@cirosantilli/_file/gmp/gmp/antihydra.c
Updated
2024-12-15
+
Created
2024-07-12
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Also posted at:
wiki.bbchallenge.org/wiki/Antihydra
cstheory.stackexchange.com/questions/20978/what-is-the-smallest-turing-machine-where-it-is-unknown-if-it-halts-or-not/53326#53326
cs.stackexchange.com/questions/59344/what-are-very-short-programs-with-unknown-halting-status/162108#162108
0
Antihydra GMP implementation
Updated
2024-12-15
+
Created
2024-07-12
0
PROMYS Europe application problem set answers
Updated
2024-12-15
+
Created
2024-07-12
View more
www.reddit.com/r/math/comments/17y9zj3/how_do_i_tackle_problems_from_the_promysross/
0
Set 2
Updated
2024-12-15
+
Created
2024-07-12
0
Antihydra
Updated
2024-12-15
+
Created
2024-07-12
View more
wiki.bbchallenge.org/wiki/Antihydra
0
X-ray tube
Updated
2024-12-15
+
Created
2024-07-12
View more
Figure 1.
Toshiba D-088 dental
X-ray tube
.
Source
.
Video 1.
William Coolidge
explains
medical imaging
and
X-rays
(1940).
Source
. Video sponsored by
General Electric
. A cool insight of this video is that a hot
cathode
is a more reliable electron source. Previous systems, and presumably including the discovery of
X-rays
, leftover gas in the tube was used. But this makes things more difficult to control, as we also want to remove as much gas as possible from the vacuum, otherwise electrons collide with the gas and lose energy before hitting the anode.
Video 2.
How Does X ray Tube Works by BiomedEngg
.
Source
. Describes in particular the rotating
cathode
method. Interesting observation that this is especially important since the cathode cannot cool quickly due to the vacuum.
0
PROMYS Europe 2024 problem set
Updated
2024-12-15
+
Created
2024-07-12
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