傅小波,廖祖華
1.無錫職業(yè)技術(shù)學(xué)院,江蘇 無錫 214121
2.江南大學(xué) 理學(xué)院,江蘇 無錫 214122
N(2,2,0)代數(shù)的(∈δ,∈δ∨qδ(λ,μ))-模糊理想*
傅小波1,廖祖華2+
1.無錫職業(yè)技術(shù)學(xué)院,江蘇 無錫 214121
2.江南大學(xué) 理學(xué)院,江蘇 無錫 214122
將模糊點(diǎn)和模糊集間的“∈(屬于)”和“q(λ,μ)(廣義重于)”關(guān)系推廣為“∈δ(Ω-屬于)”和“(Ω-重于)”關(guān)系,提出了-模糊代數(shù)。將-模糊代數(shù)與N(2,2,0)代數(shù)相結(jié)合,給出了點(diǎn)態(tài)化-模糊理想和Ω(λ,μ)-模糊理想的概念,證明了兩者之間的等價(jià)關(guān)系,研究了它們的一些基本性質(zhì);最后提出了點(diǎn)態(tài)化-模糊子代數(shù)和Ω(λ,μ)-模糊子代數(shù)的定義,研究了-模糊理想和-模糊子代數(shù)的相互關(guān)系。
N(2,2,0)代數(shù);-模糊理想;-模糊子代數(shù)
非經(jīng)典數(shù)理邏輯理論是處理不確定性信息的有力工具。近年來,越來越多的學(xué)者運(yùn)用代數(shù)學(xué)的相關(guān)理論研究非經(jīng)典邏輯。1996年,鄧方安、徐揚(yáng)從代數(shù)學(xué)的角度對(duì)fuzzy蘊(yùn)涵代數(shù)[1]的蘊(yùn)涵算子做進(jìn)一步抽象,提出了N(2,2,0)代數(shù)[2];隨后,眾多學(xué)者對(duì)N(2,2,0)代數(shù)的相關(guān)理論做了大量的研究,獲得了許多有意義的結(jié)果[3-7]。
1965年,美國(guó)控制論專家Zadeh創(chuàng)立了模糊集理論[8],隨后模糊集的思想和理論引起了眾多學(xué)者的關(guān)注,并被廣泛地應(yīng)用于各個(gè)領(lǐng)域;1980年,劉應(yīng)明在文獻(xiàn)[9-10]中給出了模糊點(diǎn)和模糊集間的“∈(屬于)”和“q(重于)”關(guān)系,極大地促進(jìn)了模糊集理論的發(fā)展;1992年,Bhakat和Das利用“∈(屬于)”和“q(重于)”關(guān)系,在文獻(xiàn)[11]中定義了(∈,∈∨q)-模糊子群。2012年,廖祖華等人將“q(重于)”關(guān)系推廣為“q(λ,μ)(廣義重于)”關(guān)系,在文獻(xiàn)[12]中引入了(∈,∈∨q(λ,μ))-模糊代數(shù),豐富了模糊集理論,并獲得了許多有意義的結(jié)果[13-15]。
2001年,Young等人在文獻(xiàn)[16]中提出了Ω-模糊集,并將其與BCK/BCI代數(shù)相結(jié)合,給出BCK/BCI代數(shù)的Ω-模糊理想的概念。2005年,詹建明等人提出了BCK/BCI代數(shù)的Ω-模糊點(diǎn)理想的概念,進(jìn)一步促進(jìn)了Ω-模糊集的發(fā)展[17]。隨后,彭家寅對(duì)Ω-模糊集做了進(jìn)一步的研究,給出了BCI代數(shù)的Ω-模糊p-理想、BCI代數(shù)的Ω-模糊H-理想、BCH代數(shù)的Ω-模糊正定關(guān)聯(lián)理想、BCH代數(shù)的Ω-模糊點(diǎn)理想等概念[18-21];2013年,廖祖華等人將Ω-模糊集與群和環(huán)相結(jié)合,并對(duì)相關(guān)的性質(zhì)進(jìn)行了研究,獲得了許多有意義的結(jié)果[22-25]。同時(shí),劉衛(wèi)鋒將Ω-模糊集應(yīng)用于布爾代數(shù),給出了Ω-模糊子代數(shù)的概念[26]。2015年,湯華晶將Ω-模糊集與軟集理論相結(jié)合,提出了Ω-模糊軟環(huán)的概念[27]。
本文在上述工作的基礎(chǔ)上,給定一個(gè)集合Ω,提出了模糊點(diǎn)和模糊集間的“∈δ(Ω-屬于)”和“(Ω-重于)”關(guān)系。若模糊點(diǎn)和模糊集間具有“∈δ(Ω-屬于)”和“(Ω-重于)”關(guān)系的代數(shù)結(jié)構(gòu),稱之為(∈δ,∈δ∨)-模糊代數(shù)。由定義8及例3可知:若令A(yù)(x,δ)=A′(x),則模糊點(diǎn)和模糊集間的“∈δ(Ω-屬于)”是“∈(屬于)”,“(Ω-重于)”是“(廣義重于)”,此時(shí),(∈δ,∈δ∨)-模糊代數(shù)是(∈,∈∨q(λ,μ))-模糊代數(shù)。在一般情況下,(∈δ,∈δ∨)-模糊代數(shù)不一定是(∈,∈∨q(λ,μ))-模糊代數(shù)。因此,(∈δ,∈δ∨)-模糊代數(shù)是一種新的代數(shù)結(jié)構(gòu)。本文將(∈δ,∈δ∨)-模糊代數(shù)與N(2,2,0)代數(shù)相結(jié)合,給出了點(diǎn)態(tài)化的(∈δ,∈δ∨)-模糊理想和(∈δ,∈δ∨)-模糊子代數(shù)的概念,并討論了其相關(guān)性質(zhì)。
定義1[2]設(shè)S是含有常元0的集合,在S中定義二元運(yùn)算*和Δ,如果?x,y,z∈S,滿足下列條件:
(1)x?(yΔz)=z?(x?y)
(2)(xΔy)?z=y?(x?z)
(3)0?x=x
則稱(S,?,Δ,0)是一個(gè)N(2,2,0)代數(shù),簡(jiǎn)稱S是一個(gè)N(2,2,0)代數(shù)。
若(S,?,Δ,0)是一個(gè)N(2,2,0)代數(shù),則(S,?)和(S,Δ)都是半群,因此N(2,2,0)代數(shù)是帶有一對(duì)對(duì)偶半群的雙半群;若將定義1中的條件(3)0?x=x,加強(qiáng)為0?x=x=x?0,則(S,?,Δ,0)代數(shù)是一個(gè)交換幺半群,且?=Δ。
例1設(shè)S={0,1},S上的運(yùn)算*和Δ的定義如表1、表2,則S={0,1}是一個(gè)N(2,2,0)代數(shù)[2],同時(shí)也是一個(gè)交換幺半群。
Table 1 Operator“*”表1 運(yùn)算“?”
Table 2 Operator“Δ”表2 運(yùn)算“Δ”
一般情況下,若(S,?,Δ,0)是一個(gè)N(2,2,0)代數(shù),且?≠Δ,則(S,?,Δ,0)不一定是交換幺半群。
例2設(shè)S={0,a,b},S上的運(yùn)算?和Δ的定義如表3、表4,則S={0,a,b}是一個(gè)N(2,2,0)代數(shù)[3],但不是交換幺半群。
Table 3 Operator“*”表3 運(yùn)算“?”
Table 4 Operator“Δ”表4 運(yùn)算“Δ”
引理1[2]若S是一個(gè)N(2,2,0)代數(shù),則?x,y,z∈S,恒有下列等式成立:
(1)x?y=yΔx;
(2)x?(y?z)=y?(x?z),(xΔy)Δz=(xΔz)Δy;
(3)(x?y)?z=x?(y?z),(xΔy)Δz=xΔ(yΔz)。
定義2[3]Q是S的子集,稱Q是S上的一個(gè)理想,如果滿足下列條件:
(1)0∈Q;
(2)?x∈Q,若x?y∈Q,則y∈Q。
定義3[15]Q是S的子集,稱Q是S上的一個(gè)子代數(shù),如果滿足下列條件:
(1)0∈Q;
(2)?x,y∈Q,有x?y∈Q且yΔx∈Q。
定義4[15]設(shè)A是S上的一個(gè)模糊子集,稱A是S廣義模糊N(2,2,0)子代數(shù),如果?x,y∈S,滿足下列條件:
(1)A(0)∨λ≥A(x)∧μ;
(2)A(x?y)∨λ≥A(x)∧A(y)∧μ;
(3)A(xΔy)∨λ≥A(x)∧A(y)∧μ。
定義5[15]設(shè)A是S上的一個(gè)模糊子集,稱A是S的(∈,∈∨q(λ,μ))-模糊N(2,2,0)子代數(shù),如果?t,r∈(λ,1]及?x,y∈S,則有:
(1)若xt∈A,則0t∈∨q(λ,μ)A;
(2)若xt∈A且yr∈A,則(x?y)t∧r∈∨q(λ,μ)A;
(3)若xt∈A且yr∈A,則(xΔy)t∧r∈∨q(λ,μ)A。
引理2[15]A是S的(∈,∈∨q(λ,μ))-模糊N(2,2,0)子代數(shù)?A是S的(λ,μ)-模糊N(2,2,0)子代數(shù)。
定義6[12]設(shè)t,λ,μ∈[0,1]且λ〈μ,A是S上的一個(gè)模糊集,若A(x)≥t,則稱xt屬于A,記作xt∈A;若λ〈t且A(x)+t>2μ,則稱xt廣義重于A,記作xtq(λ,μ)A;若xt∈A或者xtq(λ,μ)A,則記作xt∈∨q(λ,μ)A。
本文從現(xiàn)在開始恒假設(shè)λ,μ∈[0,1]且λ〈μ。
定義7[16]設(shè)Ω,X是非空給定集合,則稱映射A:X×Ω→[0,1]為X的Ω-模糊集。
給定一個(gè)集合Ω,提出了模糊點(diǎn)和模糊集間更為廣泛的“∈δ(Ω-屬于)”和“(Ω-重于)”關(guān)系的定義,并將其應(yīng)用于N(2,2,0)代數(shù),給出了(∈δ,∈δ∨)-模糊理想和(∈δ,∈δ∨)-模糊子代數(shù)的概念;研究了它們的一些基本性質(zhì)及相互之間的關(guān)系,獲得了一些有學(xué)術(shù)意義的結(jié)論。在后續(xù)的工作中,將對(duì)(∈δ,∈δ∨)-模糊代數(shù)做進(jìn)一步的研究。
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FU Xiaobo was born in 1980.He is a lecturer at Wuxi Institute of Technology,and the member of CCF.His research interests include artificial intelligence and granular computing,etc.
傅小波(1980—),男,江蘇灌云人,無錫職業(yè)技術(shù)學(xué)院講師,CCF會(huì)員,主要研究領(lǐng)域?yàn)槿斯ぶ悄?,粒?jì)算等。
LIAO Zuhua was born in 1957.He is a professor and M.S.supervisor at Jiangnan University.His research interests include artificial intelligence and granular computing,etc.
廖祖華(1957—),男,江西奉新人,江南大學(xué)教授、碩士生導(dǎo)師,主要研究領(lǐng)域?yàn)槿斯ぶ悄埽S?jì)算等。發(fā)表學(xué)術(shù)論文100多篇,主持省部級(jí)基金項(xiàng)目多項(xiàng)。
(∈δ,∈δ∨qδ(λ,μ))-Fuzzy Ideals ofN(2,2,0)Algebras*
FU Xiaobo1,LIAO Zuhua2+
1.Wuxi Institute of Technology,Wuxi,Jiangsu 214121,China
2.School of Science,Jiangnan University,Wuxi,Jiangsu 214122,China
+Corresponding author:E-mail:liaozuhua57@aliyun.com
In this paper,“Ω-belongs to(∈δ)”and“Ω-quasi-coincident with()”relationships are generalized by the view of“belongs to(∈)”and“quasi-coincident with(q)”relationships between the fuzzy point and the fuzzy set.The definition of-fuzzy algebra is presented.Combining the-fuzzy algebras and theN(2,2,0)algebras,the concepts of pointwise-fuzzy ideals andΩ(λ,μ)-fuzzy ideals are introduced, and the equivalence relationship of this two definitions is discussed.Some basic properties of them are also studied.Finally,this paper proposes the concepts of pointwise-fuzzy subalgebras andΩ(λ,μ)-fuzzy subalgebras, and studies the mutual relationships between-fuzzy ideals and-fuzzy subalgebras.
N(2,2,0)algebra;-fuzzy ideals;-fuzzy subalgebras
10.3778/j.issn.1673-9418.1512084
A
TP18
*The National Natural Science Foundation of China under Grant Nos.611702121,11401259(國(guó)家自然科學(xué)基金);the Natural Science Foundation of Jiangsu Province under Grant No.BK2015117(江蘇省自然科學(xué)基金);the Scientific Research Subject of Wuxi Institute of Technology under Grant No.3116015931(無錫職業(yè)技術(shù)學(xué)院科研課題).
Received 2015-12,Accepted 2016-03.
CNKI網(wǎng)絡(luò)優(yōu)先出版:2016-03-17,http://www.cnki.net/kcms/detail/11.5602.TP.20160317.1129.002.html
FU Xiaobo,LIAO Zuhua.(∈δ,∈δ∨qδ(λ,μ))-fuzzy ideals ofN(2,2,0)algebras.Journal of Frontiers of Computer Science and Technology,2017,11(2):323-332.