Fundamental Theorem of Arithmetic Every integer greater than 1 can be written uniquely (up to ordering) as a product of prime numbers. The existence half follows from the well-ordering principle; uniqueness is proved by induction together with Euclid’s lemma that a prime dividing a product must divide one of the factors.
In the language of unique factorization domains the statement simply asserts that \(\mathbb{Z}\) is a UFD.
Fermat’s Little Theorem If \(p\) is prime and \(a\) is an integer not divisible by \(p\), then \(a^{p-1}\equiv 1\pmod{p}\). Equivalently \(a^p\equiv a\pmod{p}\) for every integer \(a\). The result is a special case of Euler’s theorem once one observes that \(\varphi(p)=p-1\).
Quadratic Reciprocity Let \(p\) and \(q\) be distinct odd primes. Then \[ \Bigl(\frac{p}{q}\Bigr)\Bigl(\frac{q}{p}\Bigr)=(-1)^{\frac{p-1}{2}\cdot\frac{q-1}{2}}, \] where \(\bigl(\frac{\cdot}{\cdot}\bigr)\) denotes the Legendre symbol. The law completely determines the solvability of the congruence \(x^2\equiv p\pmod{q}\) in terms of the solvability of \(x^2\equiv q\pmod{p}\).
Dirichlet’s Theorem on Arithmetic Progressions If \(a\) and \(d\) are coprime positive integers, then the arithmetic progression \(a,a+d,a+2d,\dots\) contains infinitely many primes. The original proof proceeds by showing that the Dirichlet \(L\)-function \(L(s,\chi)\) attached to the non-principal character modulo \(d\) does not vanish at \(s=1\).
Prime Number Theorem The number \(\pi(x)\) of primes not exceeding \(x\) satisfies \(\pi(x)\sim\frac{x}{\log x}\) as \(x\to\infty\). Equivalently the \(n\)th prime \(p_n\) is asymptotic to \(n\log n\). The classical proofs rely on the non-vanishing of the Riemann zeta function on the line \(\operatorname{Re}s=1\).
Quantum dots are semiconductor nanocrystals composed of elements of the II-VI, III-V or IV-VI groups, such as CdS, ZnSe and InP, with sizes ranging from 2 nm to 10 nm and a core–shell structure. They exhibit properties not found in bulk semiconductor materials and demonstrate excellent photostability and non-bleaching properties even after exposure to light for a prolonged time. Some of their applications are summarized in [1]. Quantum dots are also used for optical data storage applications to induce chemical or physical changes in the nanoparticles through laser irradiation and as electron donors to enhance the sensitivity of photoswitchable molecules [2,3,4]. According to their band alignments, InP/ZnS QDs are type-I core–shell QDs and contain shell materials with a wider band gap than that of the core, which can improve the quantum yield (QY) remarkably [5]. These tiny particles find applications in various fields, such as biomedicine research and patient care, as a non-toxic alternative to Cd-based quantum dots, focusing on non-invasive imaging, preventive oncology [6], and optics, because of their peculiar optical properties. Research on II-VI and IV-VI semiconductor quantum dots (QDs) is quite widespread, while the exploration of the vast compositional space of MCQDs is still in its infancy. Significant progress has been achieved in ternary and multinary I–III–VI quantum dots, enabling precise control over band structure and optical properties. Systems such as AgInS2 with ZnS shells exhibit tunable absorption and emission, along with enhanced quantum yields due to band alignment effects [7,8]. Environmentally friendly multinary structures, e.g., Ag–In–Zn–S, have also been developed, offering near-infrared emission and suitable band offsets. More complex core–multishell architectures further improve band engineering and significantly enhance photoluminescence through optimized band alignment and surface passivation [9,10].

While policy encourages data-sharing, practice has yet to catch up. Existing literature indicates various reasons for not sharing research data. These include unavailability, privacy concerns, ethical concerns, lack of publisher compulsion, and others. It is important to address the issue of authors not responding to requests despite a promise. Policymakers also need to examine this issue to identify ways to improve data-sharing and promote open science.

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