首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Marjorie Rice was an unlikely candidate for the role of mathematical innovator. She had no formal education in mathematics and s
Marjorie Rice was an unlikely candidate for the role of mathematical innovator. She had no formal education in mathematics and s
admin
2013-10-11
90
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.
According to the passage, Marjorie Rice’s training in mathematics was_____.
选项
A、professional
B、unnecessary
C、delayed
D、limited
答案
D
解析
细节题。从第一段的第二句:“She had no formal education in mathematics and save a single courserequired for graduation from high school in 1939.”也就是说,她的数学知识很有限。
转载请注明原文地址:https://kaotiyun.com/show/4nGK777K
0
专业英语四级
相关试题推荐
WhowontheWorldCup1998footballgame?WhathappenedattheUnitedNations?Howdidthecriticslikethenewplay?【C1】______
It’ssaidthemostexcitingkindofeducationisalsothemostpersonal.Nothingcan【C1】______thejoyofdiscoveringsomething
Whatdoesthepassagemainlydiscuss?
Bycuttingdowntreeswe______thenaturalhomeofbirdsandanimals.
Whatwouldbeannouncedconcerningtheelections?
TheScholasticAptitudeTestisunderintensescrutinytoday,partlybecauseofthreatstoaffirmativeaction,changesinadmiss
Oneofthemanypleasuresofwatching"MadMen",atelevisiondramaabouttheadvertisingindustryintheearly1960s,isexamin
I______thisbookinasecondhandbookstoreonNanjingRoad.
Whatistherestaurantfamousfor?
SaharaFestival
随机试题
我国社会主义改造的任务完成以后,政治生活中处于主导地位的矛盾是()
10.己知受血者的血型为B型,在交叉配血试验中,主侧不凝集,次侧凝集,那么供血者的血型应为()。
A.胸骨左缘3~4肋间可闻及Ⅲ~Ⅳ级全收缩期反流性杂音B.胸骨左缘2~3肋间可闻及Ⅱ~Ⅲ级收缩期喷射性杂音C.胸骨左缘第2肋间可闻及响亮的连续性机器样杂音D.胸骨左缘第2~4肋间可闻及Ⅱ~Ⅲ级收缩期喷射性杂音E.胸骨左缘第4肋间可闻及Ⅱ~Ⅴ级舒张期
1周岁的小儿头围约为
细水雾灭火系统的()的设置是为了防止细水雾喷头堵塞,影响灭火效果。
在会计软件中,账簿由计算机程序自动登记。如果账簿记录有错,一般是由于用户数据输入错误的原因。()
假设从空中R点看到地表的纬线m和晨昏线n如下图所示。R点在地表的垂直投影为S。据此完成问题。若R点沿直线RS()。
阅读材料,回答问题。国家主席习近平对生态文明建设做出重要指示,强调生态文明建设是“五位一体”总体布局和“四个全面”战略布局的重要内容。各级党政机关有关方面要把生态文明建设作为一向重要的任务,扎实工作,坚持不懈,为生态安全建设做出更大贡献。
Everyoneknowsthattaxationisnecessaryinamodernstate:【21】______it,itwouldnotbepossibletopaythesoldiersand
A、How"GreatAmericanDream"isbroken.B、Fiercecompetitionintheworkplace.C、Worshiponmoneyandsocialstatus.D、Thecruel
最新回复
(
0
)