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Whereas the geography of a certain area is certainly linked in many ways to the ethnic group occupying it (or who used to occupy it), the link between the land and the language/s spoken (or that used to be spoken) can only become visible through the linguistic landscape, which not only asserts identity and ownership but can also help to reinforce prestige and vitality of the languages employed. The problem is that if the local heritage language is a minority or regional one, only in few cases can it be used to affirm the identity and ownership of its speakers. There are two sine qua non conditions for the local language to appear in the linguistic landscape: 1) The language must have gone beyond the 'threshold of literacy', i.e. it must have developed as a written language, with its own orthography and literature; 2) The language must be allowed to be used in the linguistic landscape and/or enjoy a degree of official recognition. This article presents five case studies on the presence of local minority/regional languages in the linguistic landscape based on the author’s research: two in Italy (Udine and Milan) and two in Southeast Asia (Kuala Lumpur and Bandar Seri Begawan, the capitals of Malaysia and Brunei Darussalam respectively). The very interesting situation in Macao will also be touched on, where the colonial language, Portuguese, has been given prominence in the linguistic landscape in spite of the fact that only a tiny percentage of the population can speak it. In this case, Portuguese is portrayed as a kind of heritage language (as well as an international language) that does not need to be mastered as its main function is symbolic, i.e. to help Macao retain its special status as a Special Administration Region of China.

It is extremely difficult to establish a variational principle for plasma. Kalaawy obtained a variational principle by using the semi-inverse method in 2016, and Li and He suggested a modification in 2017. This paper aims to search for a generalized variational formulation with a free parameter.

The semi-inverse method is used by suitable construction of a trial functional with some free parameters.

A modification of Li-He’s variational principle with a free parameter is obtained.

This paper suggests a new approach to construction of a trial-functional with some free parameters.