首页
登录
职称英语
Marjorie Rice was an unlikely candidate for the role of mathematical innovat
Marjorie Rice was an unlikely candidate for the role of mathematical innovat
游客
2023-11-11
39
管理
问题
Marjorie Rice was an unlikely candidate for the role of mathematical innovator. She had no formal education in mathematics and save a single course required for graduation from high school in 1939. Nonetheless, in 1975 she took up a problem that professional mathematicians had twice left for dead, and showed how much life was in still.
The roblem was tessellation, or a rectangle — and fitting it together with copies of itself so that a plane is covered without any gaps or overlap. A region this plane would look rather like jigsaw puzzle whose pieces are all identical. Rice worked primarily with polygons, which consist only of straight lines. More specifically, she worked with convex polygons, in which the line joining any tow points on the polygon lies entirely within the polygon itself or on one of its edges. (A five-pointed star, for example, does not qualify as a convex polygon.)
By the time Rice took up tiling, its basic properties had been established. Obviously, any square can tile the plane, as many kitchen floors have demonstrated. Equilateral triangles are also a fairly clear-cut case. There is one other regular polygon (a polygon whose angles, and sides, are equal) that can tile the plane: hexagon. This fact was established by the ancient Greeks but had long before been exploited by honeybees in building their honeycombs.
And what of irregular polygons? As it turns out, any triangle or quadrilateral, no matter how devoid of regularity, will tile the plane. On the other hand, no convex polygon with more than six sides can do so, and the three classes of convex polygon that can were uncovered by the end of the First World War. So the only real question left by the time Marjorie Rice began her work was which convex pentagons tile the plane. [br] The main subject of the passage is_____.
选项
A、famous mathematicians
B、mathematical education
C、tiling the plane
D、irregular polygons
答案
C
解析
主旨题。虽然文章的开始提到了Marjorie Rice这个人,但主要是为了引出下面的内容,即“The problem was tessellation,or a rectangle…”,从第二段开始主要讲的是有关“tiling of the plane”的问题。因此C是正确的。
转载请注明原文地址:https://tihaiku.com/zcyy/3176978.html
相关试题推荐
MarjorieRicewasanunlikelycandidatefortheroleofmathematicalinnovat
Hiscarelessnessis______makeitunlikelythathewillpasstheexamination.A、as
Asimilarapproachcanbe______toinnovation.A、usedB、appliedC、triedD、employe
Theonlycandidate______canhopetodefeathimfinallyquits.A、whoB、whichC、th
Inorderto______theidentityofacandidate,wemayaskyoutoshowyourID.A
Debatesamongcandidatesarerareinmostcountries.Buttheyhavebecomea
Debatesamongcandidatesarerareinmostcountries.Buttheyhavebecomea
Debatesamongcandidatesarerareinmostcountries.Buttheyhavebecomea
Debatesamongcandidatesarerareinmostcountries.Buttheyhavebecomea
Whatisthepossibi9reasonforthecandidatesfailtogetjobsattheBBC?[br]
随机试题
Mysister’sprofessorhadher______herpapermanytimesbeforepresentingitto
Hello,everyone.Itisagreatpleasuretohaveyouasassistantstohelp【B1
[originaltext]M:ThisTVsetisgettingworseandworse.Nowitdoesn’tworkat
某一非确定性有限自动机(NFA)的状态转换图如下图所示,与该NFA等价的正规式是
利率变化对个人投资理财策略会产生影响,当预期未来利率水平下降时,一般来说个人投资
()以来,全球经济一体化进程加快,金融技术日新月异,银行的经营规模越来越大
运用工程网络计划的方法编制进度计划,有利于实现进度控制的科学化,其表现为()
以下哪种病易引起肺梗死A:臁疮 B:脱疽 C:股肿 D:青蛇毒 E:压疮
关于商业银行个人理财业务,下列表述中错误的是( )。A.在理财计划存续期间,商
手外伤的术后处理,不正确的是A.抬高患肢防止肿胀 B.注射破伤风抗毒血清 C
最新回复
(
0
)