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設計のための、問題の捉え方〜ドメイン知識の暗黙知を形式知に〜(まとめ版)
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Magnolia.K
November 10, 2018
Technology
36
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設計のための、問題の捉え方〜ドメイン知識の暗黙知を形式知に〜(まとめ版)
「2018/11/8 設計Night2018 powered by Classi」で発表した資料です
当日の資料のページ数が多すぎた(140ページ)ので、2/3くらいにまとめました
Magnolia.K
November 10, 2018
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Transcript
ઃܭͷͨΊͷɺͷଊ͑ํ ઃܭφΠτQPXFSFECZ$MBTTJ .BHOPMJB, ʙυϝΠϯࣝͷ҉Λܗࣜʹʙ ʲ·ͱΊ൛ʳ
͜Ε·Ͱͷઃܭʹؔ͢Δٞ w ઃܭͱlΛׂ͠ɺߏԽ͢Δ͜ͱz w దʹߏԽ͢ΔͨΊʹʮύλʔϯʯͱʮઃܭݪଇʯ ͕༗ޮͰ͋Δ w ʮύλʔϯʯΛద༻͢Δࢦ͕ʮઃܭݪଇʯ w ʮઃܭݪଇʯͷద༻ɺlͲ͕͜มΘΓ͍͢ϙΠϯτͳ
ͷ͔zΛݟۃΊΔͱ͜Ζ͔Β l࣮گதܧγϦʔζʮ։ൃݱͰཱͨͤΔͨΊͷઃܭݪଇͱύλʔϯʯCVJMEFSTDPOzΑΓ https://nekogata.hatenablog.com/entry/2018/09/10/163206
ʮΛ͍͔ʹଊ͑Δͷ͔ʹ͍ͭͯʯ ʮ҉ͷϘτϧωοΫ͕Ͳ͏ͬͯઃܭݪଇΛ͏͔ Ͱͳ͘ɺͦͷͷͷଊ͑ํʹҠಈͨ͠ʯͱݴ͑ ΔͰ͠ΐ͏ɻ͜ͷʮͦͷͷͱͷ͖߹͍ํʯͱ͍͏ ࢹΛઃܭʹରͯ͠ಋೖͯͩ͘͠͞Δͷɺ,JDIJKPKJQN ͷΦʔΨφΠβʔͰ͋Δ!NBHOPMJB@L@ࢯͰ͢ɻ
ࣗݾհ 5XJUUFS!NBHOPMJB@L@ 1FSMͱ4DBMB͕͖ ઃܭʹ͍ͭͯͣͬͱߟ͍͑ͯΔ ٢ࣉQNΦʔΨφΠβʔ https://kichijojipm.connpass.com https://twitter.com/magnolia_k_
ࠓ͓ͳ͢͠Δ͜ͱ ͦͦʮΛଊ͑Δʯͱ ʮυϝΠϯࣝʯͷʮ҉ʯΛݟ͚ͭΔ ʮ҉ʯ͔Βʮܗࣜʯม͍͑ͯ͘ ܧଓతʹɺlΛଊ͑ΔzͨΊʹ
ͦͦʮΛଊ͑Δʯͱʁ
ݹయʹཱͪฦͬͯΈΔ ͜ͷຊʹֶΛղͨ͘Ίͷͭͷ εςοϓ͕ॻ͔Ε͍ͯΔ Λཧղ͢Δ͜ͱ ܭըΛͨͯΔ͜ͱ ܭըΛ࣮ߦ͢Δ͜ͱ
;ΓฦͬͯΈΔ͜ͱ ͜ΕιϑτΣΞͷ։ൃͷखॱͱ ಉ͡ͱݴ͑ΔͷͰͳ͍͔ʁ (ϙϦΞஶ ʮ͍͔ʹͯ͠Λͱ͔͘ʯ
ͭͷεςοϓͷɺͭʮΛཧղ͢Δ͜ͱʯʹɺ ·͞ʹʮΛଊ͑Δ͜ͱʯͦͷͷ͕ॻ͔Ε͍ͯΔ Λཧղ͢Δ͜ͱ ཁ 㾎 ະͷͷɺσʔλɺ݅Կ͔ʁ 㾎 ݅े͔ʁໃ६͍ͯ͠ͳ͍͔ʁ
㾎 ͔͖݅ද͢͜ͱ͕Ͱ͖Δ͔ʁ
݅ ͔͖ද͢͜ͱ͕ Ͱ͖Δ͔ʁ
έʔεελσΟ
έʔεελσΟͱͯ͠ɺ༩͑ΒΕͨྸʹ ͳΔΛࢉग़͢Δίʔυʹ͍ͭͯߟ͑Δ l͋ΔྸʹͳΔzΛٻΊΔܭࢉํ๏ɺҎԼͷ௨Γ ྸ͕Ճࢉ͞ΕΔͷɺىࢉʹԠ͢Δͷલͷ ຬྃ࣌ ޕޙ࣌ʣ ͭ·Γɺ๏্ੜͷલʹྸ͕Ճࢉ͞ΕΔ ྫɿ݄ੜ·Εͷਓ݄ʹ ࡀʹ౸ୡ͢Δ ࠜڌ๏ɿྸܭࢉχؔεϧ๏
w ྸग़ੜͷΑΓ೭Λىࢉ͢ w ຽ๏ୈͷنఆྸͷܭࢉʹ೭Λ४༻͢
ͱΓ࣮͋͑ͣͯ͠Έͨ ͷࢉग़ʹ3VCZͷ%BUFϞδϡʔϧΛར༻ require "date" def calc_arrival_day(b_year, b_month , b_day, age)
birthday = Date.new(b_year, b_month, b_day) arrival_day = birthday.next_year(age).prev_day(1) arrival_day.to_s end p calc_arrival_day(2000, 11, 8, 18) # “2018-11-07” ਖ਼͍͕͠ࢉग़͞Ε͍ͯΔ
ͷॲཧͳΜ͔ͩΒ ੜ͕݄ͷਓΛ ߟྀͯ͠ΔΑͶʁ ͱΓ͋͑ͣಈ͍ͨʜͰϨϏϡΞʔ͔Βͷࢦఠ
p calc_arrival_day(2000, 2, 29, 18) ʊਓਓਓਓਓਓਓਓਓʊ ʼɹ"2018-02-27"ɹʻ ʉY^Y^Y^Y^Y^Y^Y^Yʉ ͔֬ʹɺ݄͕ੜͷ߹ɺਖ਼͘͠ͳ͍ ݁Ռ͕ܭࢉ͞ΕΔ
ʜͳ͔ͥʁ
OFYU@ZFBSܭࢉ͕ͨ͠ଘࡏ͠ͳ͍ͷ ߹ɺଘࡏ͢Δ·ͰΛݮࢉ͠·͢ https://docs.ruby-lang.org/ja/latest/method/Date/i/next_year.html ͭ·Γɺʹ݄ͳ͍ͷͰɺ݄ ͕ࢉग़͞ΕɺQSFW@EBZͰߋʹͦͷલ͕ࢉग़͞Εͨ
͍ɺ๏ͷͲ͜ʹ ͦΜͳ݅ॻ͍ͯͳ͍͠ʜ ࢥΘͣɺ͜͏ݴ͍ͨ͘ͳΓ·͢Ͷ
݄ੜ·ΕΛߟྀ࣮ͨ͠ʹม͑ͯΈͨ require "date" def calc_arrival_day(b_year, b_month , b_day, age) birthday
= Date.new(b_year, b_month, b_day) arrival_day = birthday.prev_day(1).next_year(age) arrival_day.to_s end p calc_arrival_day(2000, 2, 29, 18) # “2018-2-28” ݄ੜ·Εਖ਼͘͠ͳͬͨ
݅ɺl͔͖ද͞Εͯz͍͔ͨʁ ʮྸܭࢉχؔεϧ๏ʯ͕ࣔ͢ܭࢉํ๏ɺγϯϓϧ ͳϧʔϧͰʮ݄ੜ·Εʯͱ͍͏ಛҟͳ݅lରԠ Ͱ͖ͯ͠·͍ͬͯΔzʜ͔͠͠ɺٯʹͦͷ͜ͱ͕lಛҟͳ ݅ͷଘࡏΛ͔Γʹ͘͘z͍ͯ͠Δɺͱݴ͑Δ Ծʹɺޙऀͷ࣮͕࠷ॳ͔Β༗ͬͨͱͯ͠ɺίʔυ্ʹ Ͳ͜ʹ݄ग़ͯ͜ͳ͍͜ͱʹมΘΒͳ͍
݅Λl͔͖ද͢zͨΊʹɺͳʹΛ͢Δ͔ʁ ݱঢ়ʮ͏Δ͏Ҏ֎ͷ݄Λߟྀ͢Δʯͱ ͍͏ઃܭͷҙਤ͕ίʔυ্ӅΕͯ͠·͍ͬͯΔ ޙੈͷਓʹɺ͜ͷҙਤΛ͖͢Ͱʁ
ྫ͑ɺςετΛॻ͍ͯҙਤΛ͢ require 'test/unit' class TestArrivalDay < Test::Unit::TestCase def test_calc_arrival_day assert_equal
'2018-11-07', calc_arrival_day(2000, 11, 8, 18) assert_equal '2018-02-28', calc_arrival_day(2000, 2, 29, 18) assert_equal '2017-12-31', calc_arrival_day(2000, 1, 1, 18) end end ·ͨɺ݄ʹର͢ΔϩδοΫΛ͋͑ͯ໌ࣔతʹೖΕɺ ҙਤͷ͔Γ͢͞Λ༏ઌ͢Δํ๏ʜ͋Δ͔͠Εͳ͍
݅Λl͔͖ද͢zͷɺ͍͠ ͷܭࢉͰ͏Δ͏ͷ݄Λߟྀ͢Δͱ͍͏ͷ ൺֱత͔Γ͍͢ࣄྫʜ ݱ࣮ʹɺ౸ୡ͢Δͷ͕͍͕݅͋͠ΓɺΛղ͘ ʹ͋ͨͬͯɺඞཁͳ݅Λl͔͖ද͢zͷ༰қͰͳ͍
ʮΛଊ͑Δʯͱɺ(ϙϦΞͷݴ༿ΛआΓΕɺ Λߏ͢Δͭͷཁૉ ʮະͷͷʯʮσʔλʯʮ݅ʯΛ lదʹἧ͑Δz͜ͱɺͱݴ͑ΔͷͰͳ͍͔
ݱ࣮ʹ͜ͷͭͷཁૉͷ͏ͪɺ ʮ݅ʯΛlదʹἧ͑Δ͜ͱz͍͠ ͳ͔ͥʁ ͦ͜Ͱग़ͯ͘ΔΩʔϫʔυ͕ʜ
ʮυϝΠϯࣝʯͷʮ҉ʯ
ʮυϝΠϯࣝʯͱɺʮ҉ʯ w υϝΠϯͱɺl ׆ಈŋؔ৺ŋࣝͳͲͷ ྖҬ ൣғz ͷ͜ͱ w ͭ·ΓɺʮυϝΠϯࣝʯͱɺ͍·औΓΜͰ͍Δ
ͷɺྖҬʹؔ࿈͢Δࣝ w ʮ҉ʯͱɺݴޠԽɾه߸Խ͞Ε͍ͯͳ͍ ˰ͭ·Γɺॻ͔Ε͍ͯͳ͍͜ͱ
ͭ·ΓʮυϝΠϯࣝʯͷʮ҉ʯͱɺ ʹؔ͢Δl͔͖ද͞Ε͍ͯͳ͍zࣝ
ઌ΄Ͳͷྸͷ౸ୡͷྫͰ͍͑ʜ ʲະͷ͜ͱʳ ɹྸ౸ୡΛࢉग़͢ΔϓϩάϥϜͱʁ ɹbirthday.prev_day(1).next_year(age) ʲσʔλʳ ɹੜ·Εɺʹࡀʹ౸ୡ ʲ݅ʳ ɹ݄ੜ·ΕΛߟྀ͢Δ ɹʢ͏Δ͏Ҏ֎ʹ݄ଘࡏ͠ͳ͍ʣ
๏ͷจ͚ͩͰɺΛదʹཧղ͢ΔͨΊ ʹඞཁͳʮ݅ʯ͕lυϝΠϯࣝͷ҉zͱͯ͠ ӅΕͯ͠·͍ͬͯͨ ҰํͰɺΛѻ͏ϓϩάϥϜΛॻ͍ͨܦݧͷ༗ΔਓͰ͋Εɺ݄Λߟྀ ͢Δ͜ͱʹൺֱత༰қʹࢸΔʜͱࢥΘΕΔ͕ʜ୯ͳΔܦݧ҉ʹͳΔқ͍ ʢ%BUFϞδϡʔϧͷυΩϡϝϯτʹͪΌΜͱॻ͔Ε͍ͯͨʣ
ͰɺͲ͏͢ΕΑ͍͔ʁ ͍ͬͯΔਓʹฉ͚ղܾ͢Δ͔ʁ
͊ʜͳʹΛݴ͍͍͑ͷʁ ͋ͳͨͷ͍ͬͯΔ҉Λڭ͍͑ͯͩ͘͞ ίϨ͡Όͳ͍ײ
ʮ҉ʯ͕જΜͰ͍ͦ͏ͳॴΛߟ͑ͯΈΔ
ࣄ࣮ ؔ ݪଇ
ʮखॱʯʮྺ࢙ࠜڌʯͱ͍ͬͨlࣄ࣮zɺ ҉ʹͳΓ͕ͪ 㾎 ඞཁͳखॱ͕ɺखॱॻʹॻ͔Ε͍ͯͳ͍ 㾎 ࣮ࢪ͍ͯ͠Δਓҙࣝ͠ͳ͍࡞ۀͷ֬ೝ؍ 㾎 ཤྺ ϩά ͷ͞Ε͍ͯͳ͍มߋͷʑ
㾎 ઃܭࠜڌͷ͔Βͳ͍ػೳͷʑ ࣄ࣮͕l͔͖ද͞Ε͍ͯͳ͍z͜ͱͰɺޙੈͷਓ͕ػೳΛཧղվम͢ΔͨΊ ͷʮ݅ʯ͕༰қʹἧΘͳ͘ͳͬͯ͠·͏ ͳͲͳͲʜ
͍ͬͯΔਓɺॻ͔Εͯͳͯ͘ࠔΒͳ͍͔Β
lؔzɺlࣄ࣮zҎ্ʹ҉ʹͳΓ͕ͪ 㾎 ૬ޓʹؔ࿈͢ΔෳࡶͳϏδωεཁٻͱɺγεςϜͷؔ 㾎 άϩʔόϧม͕ଟ༻͞ΕͨϞδϡʔϧߏ 㾎 ࢀরͷͨΊʹ݅ͷଟ͍ςʔϒϧઃܭ औফআ͘ɺ࣮࠶ܝɺॳظ͚ͩҧ͏ʜ ͳͲͳͲʜ ͕ؔl͔͖ද͞Ε͍ͯͳ͍z͜ͱͰɺͲ͏ḷ͍͚͔ͬͯΒͣ༰қʹ
ʮ݅ʯʹͨͲΓண͚ͳ͘ͳͬͯ͠·͏
ʮؔʯɺlʹର͢Δࢹzʜ ࣄ࣮͚ͩΛฒͯݟ͑ͯ͜ͳ͍
Ճ͑ͯɺؔΛݴ༿͚ͩͰ ਖ਼֬ʹදݱ͢Δͷ͍͠
ʮنଇʯͱҧͬͯɺlݪଇz҉ʹͳΓ͕ͪ 㾎 ໋໊͕౷Ұ͞Ε͍ͯͳ͍͕ɺͦͷ๏ଇ͕͔Βͳ͍ ΄ͱΜͲϩʔϚࣈͰɺҰ෦ӳޠͱ͔ʣ 㾎 ػೳׂͷ୯ҐϞδϡʔϧཻ͕ಛఆͷػೳ͚ͩҟͳΔ ͕ɺͦͷࢦ͕͔Βͳ͍ ʢ໌Β͔ʹಛఆͷ୲ऀͷ͚࣌ͩ࡞Γ͕ҧ͏ͱ͔ʣ ͳͲͳͲʜ ݪଇ͕l͔͖ද͞Ε͍ͯͳ͍z͜ͱͰɺͦΕ·ͰकΒΕ͖ͯͨͣͷ
ʮ݅ʯ͕ݟ͑ͳ͘ͳͬͯ͠·͏
ιϑτΣΞʹ͓͍ͯlҰ؏ੑzඇৗʹॏཁͳཁૉ lҰ؏ੑzɺʮنଇʯʮݪଇʯʹΑͬͯͨΒ͞ΕΔ Ұ؏ੑ͕ܽͨ͠ͱ͜Ζʹόά͕જΈ͍͢ʜօ͞Μࢥ͍ͨΓ·͢ΑͶʁ
ʮنଇʯͱɺʮݪଇʯ w ʮنଇʯ໌จԽ͞Ε͍ͯΔͷʢ͞Ε͍ͯΔΑͶʁʣ w ʮݪଇʯඞͣ͠໌จԽ͞Ε͍ͯΔͱݶΒͳ͍ w ແҙࣝʹܾΊͨݪଇʹैͬͯઃܭ͠ɺຊਓ͕͍֮ࣗͯ͠ͳ ͍ͱ͖ͩͬͯ͋ΔʢͳΜͱͳܾ͘Ίͨʜͱ͍͏ͭʣ w ʮݪଇʯΛܾΊͯྫ֎ؚΊͯશͯཏ͢Δͷ͍͠
w ͦͦʮݪଇʯΛܾΊΔΑ͏ͳॳظͷஈ֊Ͱɺͦ͜· Ͱߟ͍͑ͯͳ͍ɺߟ͑ΒΕͳ͍
ʮݪଇʯͷlྫ֎zΛɺ ࠷ॳ͔Βཏతʹڍ͛Δͷ͍͠
͋ΒΏΔʮݪଇʯΛॻ͖ग़ͦ͏ͱ͢Δͱɺ lࣗͷରzΈ͍ͨʹͳͬͯɺ໘͍͘͞
ࣄ࣮ʜ͔ͬͯΔ͜ͱॻ͔Εͳ͍ ؔʜԿ͕ඞཁ͔ɺ༧Ί͔Βͳ͍ ݪଇʜྫ֎ؚΊͯॻ͖͖Εͳ͍ ɹɹɹͦͦҙࣝͯ͠ͳ͍ ͳͥ҉ʹͳͬͯ͠·͏ͷ͔ʁ
Ͱɺڭ͑ͯΒͬͨΓɺ ࣗͷதʹ͋Δ҉ Ͳ͏͢Ε͍͍͔ʁ
ʮ҉ʯ͔Βʮܗࣜʯ
ʮܗࣜʯʹ͍ͯ͘͠ w ʮܗࣜʯͱɺݴޠԽɾه߸Խ͞Ε͍ͯΔ ˰ͭ·Γɺॻ͔Ε͍ͯΔ͜ͱ
ʮࣄ࣮ʯΛlܗࣜzʹ
8)Ͱɺ͔͖ද͢
8) w 8IFO ͍ͭ w 8IFSF Ͳ͜Ͱ w
8IP ͩΕ͕ w 8IBU ͳʹΛ w 8IZ ͳͥ w )PX Ͳ͏ͬͯ
Ͳ͜ʹॻ͔͘ʁ ͍͞Θ͍ɺϓϩάϥϜʮखॱʯɺͭ·ΓIPXͦͷͷ ͔͠͠ɺίʔυࣗମʹIPX༗ͬͯɺXIZΛॻ͘ॴ Ͱͳ͍ ͰɺͲ͜ʹॻ͖͔͘ʁ
https://twitter.com/t_wada/status/904916106153828352 ͦΕͧΕɺॻ͘ͷʹ;͞Θ͍͠ॴߟ͑Δ
͢ॴɺະདྷΛߟܾ͑ͯΊ͍ͯ͘ ςετίʔυɺίϛοτϩάɺίʔυίϝϯτɺ 3&"%.&ɺ(JU)VCɺ2JJUBɺ4MBDLɺXJLJɺ ݴޠͷυΩϡϝϯτػೳ +BWBEPDͱ͔ ʜ ͱʹ͔ͪ͘ΌΜͱݕࡧͰ͖ɺޙੈͷਓ͕౸ୡͰ͖Δॴɺ ࢀরͰ͖ΔܗࣜͰ͢
ݸਓͷ1$ͷϩʔΧϧ ΞʔΧΠϒ͞Εͳ͍.- μϝɺઈର!
lؔzΛܗࣜʹ
ਤදͰɺ͔͖ද͢
ਤදͰɺ͔͖ද͢ w ͞·͟·ͳਤ๏ɾه๏ɺूΊΒΕͨࣄ࣮͔ΒؔΛಋ ग़͢ΔͨΊͷʮࢹʯΛఏڙ͢Δ w ΑΓϏδωεཁٻʹ͍ۙϨΠϠʔΛ͔͖ද͢ʹదͨ͠ ʮϏδωεϑϨʔϜϫʔΫʯ͕ࢀߟʹͳΔ ྫ͑ʮ"T*T5P#FϞσϧʯʮϩδοΫπϦʔʯ w
ΑΓίʔυʹ͍ۙϨΠϠʔΛ͔͖ද͢ʹඪ४Խ͞Εͨ lϞσϦϯάਤ๏zΛ͏ ྫ͑ʮ&3ਤʯʮ6.- $MBTTਤ4FRVFODFਤʜ ʯ
ͳͥؔΛ͔͖ද͔͢ʁ ΫϥεܧঝςʔϒϧͷϦϨʔγϣϯΛఆٛ͠ͳͯ͘ɺ ಈ͘ίʔυॻ͚Δ ͔͠͠ɺͦΕͰઃܭऀͷҙਤΘΒͳ͍ͷͰɺະདྷ ͷͨΊʹɺҙਤͨ͠lؔzΛه๏ɾਤ๏Ͱ͑Δ
lؔzΛίʔυʹຒΊࠐΉ lؔzίʔυʹຒΊࠐ·ΕΕɺΑΓ໌֬ͳʮ੍ʯ ͱͳΓɺʮlΑΓڧ͍zܗࣜʯͱͳΔ ʢݴޠػೳͰΫϥεܧঝΛఆٛ͢Δɺ%#.4ͷεΩʔϚ ʹϦϨʔγϣϯΛషΔʣ
طଘͷਤ๏ɾه๏͋͘·ͰϕετϓϥΫςΟεʜ ࢀߟʹͳΔ͕ɺ߆Γա͗ͣɺ؆қͰΞυϗοΫͰ ͍͍ͷͰɺ·ͣඳ͍ͯΈΔ
܁Γฦ͚͢Ͳɺʮؔʯlʹର͢Δࢹzɺ ͭ·Γlઃܭऀͷҙਤz͕ΓɺΘΔ͜ͱ͕େࣄ
ʮݪଇʯΛlܗࣜzʹ
೦ͳ͕ΒɺʮݪଇʯΛܗࣜʹ͢Δఆܕతͳ ख๏·ͩແͦ͞͏ʜݴ༿จষͰॻ͍͍ͯ͜͏ ʢ༗ͬͨΒڭ͍͑ͯͩ͘͞ʣ
ݫີʹߟ͑͗ͣ͢ɺlݪଇΏΔ͔ͳҰ؏ੑΛ Βͨ͢ͷz͘Β͍ʹଊ͑ͯɺ͔͖ද͍ͯ͘͠
ʮઃܭݪଇʯʮ։ൃํʯʮઃܭࢥʯͳͲɺ ࠷ॳࢄʑٞ͢ΔͷʹɺΕڈΒΕ͕ͪ
ܧଓతʹɺ lΛଊ͑ΔzͨΊʹ
Ұ൪େࣄͳ
lͲ͜·ͰΕ͍͍ͷ͔ʁz
έʔεόΠέʔεͬͯ ݴ͍ͨ͘ͳͬͯ͘Δͭ
ಛʹʮؔʯɺͭ·ΓlࢹzͳͷͰɺ༨ܭͳlࢹz ٯʹࠞཚΛট͖ɺ͔͔Δ ͭ·Γʮૣ͗͢Δ࠷దԽѱʯͱ͍͏ɺ͍ͭͷʹܨ ͕͍ͬͯ͘
େ͗͢ΔʮܗࣜʯɺlܗࣜͷಡΈऔΓํz ͱ͍͏ʮ҉ʯΛੜΈग़͢ ͓ͳ͡Έͷྫɿ EnterpriseQualityCoding/FizzBuzzEnterpriseEdition
ᘳΛࢦ͗͢͠ͳ͍ͨΊͷɺͭͷج४ ʮޙʹ·ͬͨ͘ɺಉۤ͡࿑Λͤ͞ͳ͍ʯ ʮมߋ͞Ε͍͢ͱ͜ΖͲ͔͜ʁʯ ಛʹޙऀɺ֎ΕΔՄೳੑવ༗Δ͚Ͳ ʮมߋ͞Ε͍͢ʯΠίʔϧʮՁ͕ߴ͍Օॴʯ Մೳੑ͕ߴ͍ͷͰɺগͳ͘ͱͦͷٞແବʹͳΒͳ͍
͜Ε·ͰͷΛ·ͱΊ·͢
lΛଊ͑ΔzͱɺlΛཧղ͢Δz͜ͱ ͦͷͨΊʹɺ͜Ε·ͰੵΈॏͶΒΕͨʮࣄ࣮ʯͱɺͦ ͷؒʹ͋ΔʮؔʯΛఆٛ͠ɺͦΕΒ͕ಋ͔Ε͖ͯͨʮݪ ଇʯΛݴ༿ʹॻ͖දͯ͠ΈΔ ͦ͏͢Δ͜ͱͰΛཧղ͢ΔͨΊʹඞཁͳʮ݅ʯ͕ ἧͬͯ͘Δ
ࠓ͓ͳͨ͜͠͠ͱ ·ͱΊ w ͦͦʮΛଊ͑Δʯͱ w ʮυϝΠϯࣝʯͷʮ҉ʯΛݟ͚ͭΔ w ʮ҉ʯ͔Βʮܗࣜʯม͍͑ͯ͘ w
ܧଓతʹɺlΛଊ͑ΔzͨΊʹ
w ͦͦʮΛଊ͑Δʯͱ 㾎 ʹؔ͢Δʮະͷ͜ͱʯʮσʔλʯʮ݅ʯͷ ཁૉΛἧ͑Δ͜ͱ 㾎 ͔͠͠ɺͦͷதͰʮ݅ʯΛἧ͑Δͷ͍͠
w ʮυϝΠϯࣝʯͷʮ҉ʯΛݟ͚ͭΔ 㾎 ʮ݅ʯΛἧ͑Δͷ͕͍͠ͷɺʹؔ͢Δ ʮυϝΠϯࣝʯ͕ʮ҉ʯʹͳ͍ͬͯΔ͔Β 㾎 l҉zʹͳ͍ͬͯΔʮ݅ʯΛ୳ͨ͢Ίʹ ʮࣄ࣮ʯʮؔʯʮݪଇʯʹண͢ΔͱΑ͍
w ʮ҉ʯΛʮܗࣜʯʹม͍͑ͯ͘ 㾎 ʮࣄ࣮ʯɺl8)zΛ໌Β͔ʹ͢Δ 㾎 ʮؔʯɺlࢹzΛ༩͑Δਤ๏ɾه๏Λ͏ 㾎 ʮݪଇʯɺlΏΔ͔ͳҰ؏ੑzͱଊ͑ɺ࠷ॳʹ ߟ͑ͨ͜ͱΛॻ͖ग़ͯ͠ΈΔ
w ܧଓతʹɺlΛଊ͑ΔzͨΊʹ 㾎 lܗࣜzʹશແ͍ͷͰɺશΛࢦ͞ͳ͍ 㾎 ଞͷਓʹlಉۤ͡࿑ͤ͞ͳ͍zͱɺ͜ͷઌ lมΘΓͦ͏ͳͱ͜Ζzͱ͍͏؍ʹྗ͢Δ
ࠓ͞ͳ͔ͬͨ͜ͱ w ࣮ɺʮج४ʯ҉ʹͳΓ͕ͪ w ࣮ɺʮσʔλʯἧ͑Δͷ͍͠ w ʮੳʯʹΑͬͯʮະͷ͜ͱʯมΘΔ͜ͱ͕͋Δ w ݁ہɺἧ͑ͨཁૉΛʮੳʯ͠ɺͦͷ݁ՌΛͲ͏ͬͯ ʮઃܭʯʹܨ͍Ͱ͍͔͘ʁ
࠷ޙʹઃܭʹ͍͖ͭͯͳ ݴ༿Λհͯ͠కΊ·͢
Dick Hamming ʮޡͬͨΛਖ਼͘͠ղ͘ΑΓɺ ਖ਼͍͠Λޡͬͨํ๏Ͱղ͘ํ͕Α͍ʯ
ޚਗ਼ௌ# ͋Γ͕ͱ͏͍͟͝·ͨ͠
ڞಉԽ දग़Խ ࿈݁Խ ໘Խ ҉ ܗࣜ ܗࣜ ҉ ܗ ࣜ
ܗ ࣜ ҉ ҉ தҮ࣍ஶ ʮࣝاۀʯ ʮ҉ʯ˰ʮܗࣜԽʯͱ͍͑ɺ4&$*Ϟσϧ͕ΒΕ͍ͯΔ ྫ͑ϖΞϓϩɺʮڞಉԽʯͷϓϩηεͦͷͷͱݴ͑Δ ʲࢀߟจݙʳ