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### krishnapal singh

Discussion -what is the concept of zoom option in machine like mobile or laptop? is similarity of figure?

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I'm bit confusing about projection. How to project a machine of an object?

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### Manuel Hernández Rosales

Discussion -Una secuencia didáctica para que los alumnos descubran por si mismos las geometrías no euclidianas. https://www.researchgate.net/publication/302008069_Secuencia_didactica_Geometria_en_la_esfera?ev=prf_pub

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### krishnapal singh

Discussion -What is the difference between these lines-

(i) there exists x in set of real no. ,for all y in set of real no such that x+y>0

(ii) for all x in set of real no., there exists y in set of real no. such that x+y >0

(i) there exists x in set of real no. ,for all y in set of real no such that x+y>0

(ii) for all x in set of real no., there exists y in set of real no. such that x+y >0

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thanks

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### David Kotschessaowner

Modern History - In 1900, David Hilbert published a list of twenty-three open questions in mathematics, ten of which he presented at the International Congress of Mathematics in Paris that year. Hilbert had a good nose for asking mathematical questions as the ones on his list went on to lead very interesting mathematical lives. Many have been solved, but some have not been, and seem to be quite difficult. In both cases, some very deep mathematics has been develop...

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Refurio Anachro

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Wonderful article! After a long time shaking my head at people still trying to solve the continuum hypothesis, a few years ago, I started to very slowly change my opinion to: perhaps that might still happen!

During that time, one or perhaps a few hunches have sneaked in and I'd like to check if they even make sense (are answered in the literature, etc...), but I haven't managed to capture my ideas in proper questions.

[Edit: So I might ask people to talk me out of it. My feeling clearly says that there's something I don't understand. Phew, I almost forgot that this is dangerous territory.]

Logic is subtle and quite complicated. I really like the outlook at the end. Two front lines, and a dazzling result asking to change the rules.

During that time, one or perhaps a few hunches have sneaked in and I'd like to check if they even make sense (are answered in the literature, etc...), but I haven't managed to capture my ideas in proper questions.

[Edit: So I might ask people to talk me out of it. My feeling clearly says that there's something I don't understand. Phew, I almost forgot that this is dangerous territory.]

Logic is subtle and quite complicated. I really like the outlook at the end. Two front lines, and a dazzling result asking to change the rules.

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### Nosheen Akhtar

Early History -What is the history behind sine,cosine and tangent in math?

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6 comments

+MichaelKingsfordGray thanks

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### About this community

This community is for anyone interested in the history of mathematics from ancient to modern times. Anybody interested in math history at *any* level is welcome.
NOTE: While there are a lot of interesting math memes, jokes, etc. floating around the Internet, we limit our discussion to topics of historical interest. Other posts will be removed.

### Trịnh Minh Hải

Modern History -Only 1 In 1000 Can Solve This Math Problem. Are You One Of Them?

0+1=1

1+2=9

2+3=15

3+4=35

4+5=?

0+1=1

1+2=9

2+3=15

3+4=35

4+5=?

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15 = (2+3)*(1+2)

35 = (3+4)*(2+3)

63 = (4+5)*(3+4)

35 = (3+4)*(2+3)

63 = (4+5)*(3+4)

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### Pat Ballewmoderator

Today in History - Thanks for the great memories, Students of Lakenheath Perhaps... some day the precision of the data will be brought so far that the mathematician will be able to calculate at his desk the outcome of any chemical combination, ...

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### Bruce Mincks

Discussion -Let's not confuse the means with "non-contradiction"; the results are absurd.

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### Arindam Bose

Modern History -Did You Know: What really made Italian mathematician Leonardo Pisano so famous?

Visit the post for more.

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Fibonacci is so to be added...

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