پروفسور امیدعلی شهنی کرمزاده ( ۱۳۲۳ مسجدسلیمان ), استاد دانشگاه چمران اهواز، چهره ماندگار ریاضی سال 84 . برنده جایزه ترویج علم ایران.
@infinitymath
@infinitymath
علیرضا مدقالچی (زادهٔ ۱۳۳۰ در اهر) ریاضیدان، مترجم، نویسنده و استاد دانشگاه خوارزمی است. وی در سال ۱۳۸۹ به عنوان چهرهٔ ماندگار رشتهٔ ریاضیات معرفی شد.
@infinitymath
@infinitymath
پروفسور سید عبادالله محمودیان ( ۱۳۲۲ زنجان)، استاد دانشگاه صنعتی شریف، چهره ماندگار ریاضی سال89، زمینه تحقیقاتی: رنگ آمیزی گرافها، طرحهای ترکیبیاتی، برنده جایزه ملی علامه طباطبائی.
@infinitymath
@infinitymath
پروفسور بهمن مهری ( 1314 رشت ) استاددانشگاه صنعتی شریف و تحصیلات تکمیلی زنجان، چهره ماندگار ریاضی سال 81. زمینهٔ تحقیقات: معادلات دیفرانسیل
@infinitymath
@infinitymath
Forwarded from دستیار زیر نویس و هایپر لینک
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@infinitymath
@infinitymath
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کاشیکاری دایره به روش موریس اشر با الهام از هندسه هذلولوی
نام اثر:
Circle limit
📡 @infinitymath
📡 @infinitymath
نام اثر:
Circle limit
📡 @infinitymath
📡 @infinitymath
Forwarded from دستیار زیر نویس و هایپر لینک
The Ulam sequence is a sequence of positive integers a_n, where a_1=1, a_2=2, and where each a_n for n > 2 is defined to be the smallest integer that can be expressed as the sum of two distinct earlier terms in a unique way.
The first few terms of the sequence are shown in the picture: 1, 2, 3, 4, 6, 8, 11, 13, 16, 18, 26, 28, 36, 38, 47. The third term is 3, because 3=1+2. The fourth term is 4, because although 4 can be expressed in two ways as the sum of two earlier terms (1+3, or 2+2) the sum “2+2” is not a sum of distinct earlier terms. The fifth term is not 5, because 5=1+4=2+3; rather, it is 6, which is 2+4. The sixth term is not 7, because 7=1+6=3+4, but rather 8, which is 2+6. And so on.
The Ulam sequence is named after the Polish-American mathematician Stanisław Ulam (1909–1984) who introduced it in 1964 in a survey on unsolved problems. Ulam remarked that it can be notoriously difficult to answer questions about the properties of sequences like this one, even if they are defined by a simple rule.
@infinitymath
The first few terms of the sequence are shown in the picture: 1, 2, 3, 4, 6, 8, 11, 13, 16, 18, 26, 28, 36, 38, 47. The third term is 3, because 3=1+2. The fourth term is 4, because although 4 can be expressed in two ways as the sum of two earlier terms (1+3, or 2+2) the sum “2+2” is not a sum of distinct earlier terms. The fifth term is not 5, because 5=1+4=2+3; rather, it is 6, which is 2+4. The sixth term is not 7, because 7=1+6=3+4, but rather 8, which is 2+6. And so on.
The Ulam sequence is named after the Polish-American mathematician Stanisław Ulam (1909–1984) who introduced it in 1964 in a survey on unsolved problems. Ulam remarked that it can be notoriously difficult to answer questions about the properties of sequences like this one, even if they are defined by a simple rule.
@infinitymath
There are certainly people who regard √2 as something perfectly obvious but jib at √-1.
This is because they think they can visualise the former as something in physical space but not the latter.
Actually √-1 is a much simpler concept.
~Edward Titschmarsh
@infinitymath
This is because they think they can visualise the former as something in physical space but not the latter.
Actually √-1 is a much simpler concept.
~Edward Titschmarsh
@infinitymath
I learned to distrust all physical concepts as the basis for a theory. Instead one should put one's trust in a mathematical scheme, even if the scheme does not appear at first sight to be connected with physics. One should concentrate on getting interesting mathematics.
~ Paul Dirac
@infinitymath
~ Paul Dirac
@infinitymath