晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/opt/alt/ruby18/share/ri/1.8/system/Math/
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--- !ruby/object:RI::ClassDescription 
attributes: []

class_methods: 
- !ruby/object:RI::MethodSummary 
  name: acos
- !ruby/object:RI::MethodSummary 
  name: acosh
- !ruby/object:RI::MethodSummary 
  name: asin
- !ruby/object:RI::MethodSummary 
  name: asinh
- !ruby/object:RI::MethodSummary 
  name: atan
- !ruby/object:RI::MethodSummary 
  name: atan2
- !ruby/object:RI::MethodSummary 
  name: atanh
- !ruby/object:RI::MethodSummary 
  name: cos
- !ruby/object:RI::MethodSummary 
  name: cosh
- !ruby/object:RI::MethodSummary 
  name: erf
- !ruby/object:RI::MethodSummary 
  name: erfc
- !ruby/object:RI::MethodSummary 
  name: exp
- !ruby/object:RI::MethodSummary 
  name: frexp
- !ruby/object:RI::MethodSummary 
  name: hypot
- !ruby/object:RI::MethodSummary 
  name: ldexp
- !ruby/object:RI::MethodSummary 
  name: log
- !ruby/object:RI::MethodSummary 
  name: log10
- !ruby/object:RI::MethodSummary 
  name: sin
- !ruby/object:RI::MethodSummary 
  name: sinh
- !ruby/object:RI::MethodSummary 
  name: sqrt
- !ruby/object:RI::MethodSummary 
  name: tan
- !ruby/object:RI::MethodSummary 
  name: tanh
comment: 
- !ruby/struct:SM::Flow::P 
  body: The <tt>Math</tt> module contains module functions for basic trigonometric and transcendental functions. See class <tt>Float</tt> for a list of constants that define Ruby's floating point accuracy.
constants: 
- !ruby/object:RI::Constant 
  comment: 
  name: PI
  value: rb_float_new(M_PI)
- !ruby/object:RI::Constant 
  comment: 
  name: PI
  value: rb_float_new(atan(1.0)*4.0)
- !ruby/object:RI::Constant 
  comment: 
  name: E
  value: rb_float_new(M_E)
- !ruby/object:RI::Constant 
  comment: 
  name: E
  value: rb_float_new(exp(1.0))
full_name: Math
includes: []

instance_methods: 
- !ruby/object:RI::MethodSummary 
  name: acos
- !ruby/object:RI::MethodSummary 
  name: acosh
- !ruby/object:RI::MethodSummary 
  name: asin
- !ruby/object:RI::MethodSummary 
  name: asinh
- !ruby/object:RI::MethodSummary 
  name: atan
- !ruby/object:RI::MethodSummary 
  name: atan2
- !ruby/object:RI::MethodSummary 
  name: atanh
- !ruby/object:RI::MethodSummary 
  name: cos
- !ruby/object:RI::MethodSummary 
  name: cosh
- !ruby/object:RI::MethodSummary 
  name: exp
- !ruby/object:RI::MethodSummary 
  name: log
- !ruby/object:RI::MethodSummary 
  name: log10
- !ruby/object:RI::MethodSummary 
  name: rsqrt
- !ruby/object:RI::MethodSummary 
  name: sin
- !ruby/object:RI::MethodSummary 
  name: sinh
- !ruby/object:RI::MethodSummary 
  name: sqrt
- !ruby/object:RI::MethodSummary 
  name: sqrt
- !ruby/object:RI::MethodSummary 
  name: tan
- !ruby/object:RI::MethodSummary 
  name: tanh
name: Math
superclass: