AS COISAS SÃO ASSIM?

Como as Coisas Rodam

Exerćıcio 1.1. Suponha que f : R → R preserva a distância Euclidiana e fixa a origem. Mostre que: (1) f leva segmentos de recta em segmentos de recta; (2) f(λx) = λf(x) para λ ∈ R e x ∈ R; (3) f leva o ponto médio de um segmento no ponto médio da sua imagem; (4) f(x+ y) = f(x) + f(y) para x,y ∈ R; (5) 〈f(x), f(y)〉 = 〈x,y〉 para x,y ∈ R; (6) f(x) = Sx para x ∈ R, onde S ∈ M3×3 é ortogonal (ou sej...

Ontologia das Coisas para Espaços Inteligentes Baseados em Visão Computacional

Necessary Truth and Proof

What makes necessary truths true? I argue that all truth supervenes on how things are, and that necessary truths are no exception. What makes them true are proofs. But if so, the notion of proof needs to be generalized to include verification-transcendent proofs, proofs whose correctness exceeds our ability to verify it. It is incumbent on me, therefore, to show that arguments, such as Dummett’...

[Dengue control as viewed by agents and the target population in São José do Rio Preto, São Paulo, Brazil].

The aim of this article was to identify daily situations experienced by dengue control agents in their relationship to local residents. A cross-sectional study applied questionnaires among vector control agents, community health workers, and a sample of local women. The answers by the dengue control agents and community health workers were grouped in the categories of work, private life, and co...

Echinodermata from São Sebastião Channel (São Paulo, Brazil).

Faunal inventories are extremely important, especially when focused on neglected groups, such as echinoderms, and concentrated on areas under intense anthropic activity such as the SAo Sebastilo Channel in Brazil (23 degrees 41' - 23 degrees 54' S and 45 degrees 19' - 45 degrees 30' W). Intertidal and upper sublittoral zone collections were performed at five sites of the Channel's continental m...