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Second tier problems

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The chromatic class of the cartesian product of graphs✭0Graph Theorypet_petros
S(f)oS*(f) = S*(f)oS(f) = S*(f)Porton✭0Topologyporton
Direct product of reloids is a complete lattice homomorphismPorton✭0Topologyporton
pushing Bertrand series✭0AnalysisJerome JEAN-CHARLES
Are there infinitely many counterexamples to the Goldbach Conjecture? Is it possible to find out?Nguyen✭0Logicnamducnguyen
Function over multiplication✭1Unsortededdybob123
Does every odd number coprime to its Euler totient divide some Carmichael number?Michon✭✭1Number Theory » Computational N.T.maxal
Monovalued reloid and its restrictionsPorton✭✭0Topologyporton
Distributivity of inward reloid over composition of funcoidsPorton✭✭0Topologyporton
Set of connected components of a filterPorton✭✭0Topologyporton
Enumerating the number of binary relations✭✭1Combinatoricsarbitrary
S(S(f)) = S(f) for funcoidsPorton✭✭0Topologyporton
S(f)oS(f)=S(f) for funcoidsPorton✭✭0Topologyporton
S(f)oS(f)=S(f) for reloidsPorton✭✭0Topologyporton
S*(f)oS*(f)=S*(f)Porton✭✭0Topologyporton
Compatible Matching ConjectureWood✭✭0Graph Theory » Topological G.T. » DrawingsRobert Samal
Non-separable center of a latticePorton✭✭0Algebraporton
Separators in string graphsFox; Pach; Tóth✭✭0Graph Theorycibulka
Outer reloid of identity funcoidPorton✭✭0Topologyporton
Composition of funcoids expressed through composition of binary relationsPorton✭✭0Topologyporton
Cross-composition product of pointfree funcoids is a quasi-cartesian functionPorton✭✭0Topologyporton
Cross-composition product of reloids is a quasi-cartesian functionPorton✭✭0Topologyporton
Sub-elements of reloidal productsPorton✭✭0Topologyporton
Join of completary multifuncoids may be not completaryPorton✭✭0Topologyporton
Star composition with join of multifuncoidsPorton✭✭0Topologyporton
Star composition with join of multireloids✭✭0Algebraporton
Discrete MathematicsKRISHNARAM VENKATESH; PARASURAMAN DIVYA✭✭1Number Theory » Computational N.T.VENKATESH TK
On-Line Ohba's ConjectureHuang; Wong; Zhu✭✭1Graph Theory » Coloring » Vertex coloringJon Noel
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