On $$C^1$$ C 1 , $$C^2$$ C 2 , and weak type-(1, 1) estimates for linear elliptic operators: part II

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THE WEAK-TYPE (1, 1) OF FOURIER INTEGRAL OPERATORS OF ORDER −(n − 1)/2

Let T be a Fourier integral operator on R n of order −(n − 1)/2. In [4] it was shown (among other things) that T maps the Hardy space H 1 to L 1. In this note we show that T is also of weak-type (1, 1). The main ideas are a decomposition of T into non-degenerate and degenerate components, and a factorization of the non-degenerate portion.

(μ3-Hydrido)[μ3-2-(tri­methyl­sil­yl)ethyl­idyne-κ3 C 1:C 1:C 1]tetra­kis­[(η5-cyclo­penta­dien­yl)cobalt(II)]

In the title compound, [Co4(C5H5)4(μ3-CCH2SiMe3)(μ3-H)], the Co atoms form a distorted tetra-hedron with the ethyl-idyne moiety bridging three of the Co atoms as well as the hydrido ligand also bridging three of the Co atoms. The Co-Co bond lengths in the Co4 tetrahedron vary from 2.3844 (4) to 2.4608 (4) Å. Each Co atom is additionally η(5)-bonded to a cyclopentadienyl (Cp) anion.

1 2 C or Not 2 C ?

Political attention has increasingly focused on limiting warming to 2°C. However, there is no consensus on both questions “Is the 2°C target achievable?” and “What should be done with this target that becomes increasingly difficult to achieve?”. This paper aims at disentangling the points of deep uncertainty underlying this absence on consensus. It first gives simple ha ls hs -0 07 50 70 4, v e...