數(shù)學(xué)學(xué)院邀請(qǐng)東北大學(xué)孫華清作學(xué)術(shù)報(bào)告

       應(yīng)學(xué)院副院長(zhǎng)吳楚芬教授的邀請(qǐng),，東北大學(xué)孫華清教授于9月3日上午9點(diǎn)，在致用樓學(xué)院501開(kāi)展了關(guān)于“On essential spectra of singular Hamiltonian systems”的學(xué)術(shù)報(bào)告,。吳楚芬教授主持學(xué)術(shù)報(bào)告會(huì),，學(xué)院微分方程方向老師及研究生參會(huì),。整個(gè)學(xué)術(shù)報(bào)告精彩紛呈，理論與應(yīng)用相結(jié)合,，引起了師生熱烈的反響,。報(bào)告后，孫華清教授針對(duì)研究生和年輕博士老師們提出的疑問(wèn),，開(kāi)展了專(zhuān)門(mén)的輔導(dǎo),，并確定了合作的研究?jī)?nèi)容。

       報(bào)告簡(jiǎn)介：This talk is concerned with essential spectra of Hamiltonian systems with one singular endpoint. The characterization of each element of the essential spectrum in terms of certain singular sequences is given, the concept of perturbation small at the singular endpoint is introduced, and the stability of the essential spectrum is obtained under this  perturbation. Some sufficient conditions for the invariance of the essential spectrum are given in terms of coefficients of Hamiltonian systems. In addition,，the corresponding results are obtained for the essential numerical ranges of semi-bounded systems.

       孫華清教授簡(jiǎn)介：東北大學(xué)教授,，博士生導(dǎo)師，東北大學(xué)數(shù)學(xué)與交叉科學(xué)研究中心主任,，微分方程及其應(yīng)用遼寧省教育廳重點(diǎn)實(shí)驗(yàn)室主任,，遼寧省數(shù)學(xué)會(huì)數(shù)學(xué)交叉與應(yīng)用委員會(huì)主任，遼寧省首席科學(xué)傳播專(zhuān)家,，沈陽(yáng)市領(lǐng)軍人才,。從事奇異微分與差分算子譜理論研究，在“J. Funct. Anal.”,，“J. Differential Equations”,，“Proc. Roy. Soc. Edinburgh Sect. A”,，“Stud. Math. Appl.”等國(guó)際權(quán)威雜志上發(fā)表和接受30多篇。曾主持完成國(guó)家自然科學(xué)基金項(xiàng)目和省部級(jí)項(xiàng)目多項(xiàng),，參與國(guó)家級(jí)和省級(jí)項(xiàng)目多項(xiàng),。