Reflexões sobre o ensino da matemática e diversidade cultural

Países como Colômbia e Moçambique caracterizam-se pela sua diversidade e riquezas culturais. Nesta conferência plenária apresentar-se-ão algumas reflexões sobre educação matemática em contextos de diversidade cultural. Como se podem preparar educadores e professores para trabalhar numa sala de aula multicultural? Como se podem motivar alunos de origens sócio-culturais diferentes? Como se pode contribuir para a realização do potencial matemático de todos os estudantes. Para estimular a reflexão dos participantes sobre este tipo de questões, serão apresentadas algumas experiências de pesquisa e de docência do palestrante. A conferencia plenária é acompanhada pela realização, em três sessões, do mini-curso “Explorar algumas ideias matemáticas de origem africana na educação matemática”

African slave and calculating prodigy: Bicentenary of the death of Thomas Fuller

AbstractThomas Fuller (1710–1790) was an African, shipped to America as a slave in 1724. He had remarkable powers of calculation, and late in his life was discovered by antislavery campaigners who used him as a demonstration that blacks are not mentally inferior to whites. This paper describes what we know of Fuller, discusses the various uses made of his story since his death, and appeals for further study of the 18th-century African ethnomathematical context

Desenhos Tradicionais na Areia em Angola e seus Possíveis Usos na Aula de Matemática

Tanto países industrializados como também países do Terceiro Mundo enfrentam a necessidade de “multi-culturizar” seus currículos matemáticos. Após uma breve descrição da tradição do desenho do povo Tchokwe (Angola), dão-se algumas sugestões de possíveis usos dos seus pictogramas na aula de matemática. Os exemplos dados neste artigo vão do estudo de relações aritméticas, progressões, simetria, semelhanças e grafos de Euler à determinação do máximo divisor comum de dois números naturais

Validation of selection function, sample contamination and mass calibration in galaxy cluster samples

We construct and validate the selection function of the MARD-Y3 galaxy cluster sample. This sample was selected through optical follow-up of the 2nd ROSAT faint source catalogue with Dark Energy Survey year 3 data. The selection function is modelled by combining an empirically constructed X-ray selection function with an incompleteness model for the optical follow-up. We validate the joint selection function by testing the consistency of the constraints on the X-ray flux-mass and richness-mass scaling relation parameters derived from different sources of mass information: (1) cross-calibration using South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) clusters, (2) calibration using number counts in X-ray, in optical and in both X-ray and optical while marginalizing over cosmological parameters, and (3) other published analyses. We find that the constraints on the scaling relation from the number counts and SPT-SZ cross-calibration agree, indicating that our modelling of the selection function is adequate. Furthermore, we apply a largely cosmology independent method to validate selection functions via the computation of the probability of finding each cluster in the SPT-SZ sample in the MARD-Y3 sample and vice versa. This test reveals no clear evidence for MARD-Y3 contamination, SPT-SZ incompleteness or outlier fraction. Finally, we discuss the prospects of the techniques presented here to limit systematic selection effects in future cluster cosmological studies

Dimethyl fumarate in patients admitted to hospital with COVID-19 (RECOVERY): a randomised, controlled, open-label, platform trial

Dimethyl fumarate (DMF) inhibits inflammasome-mediated inflammation and has been proposed as a treatment for patients hospitalised with COVID-19. This randomised, controlled, open-label platform trial (Randomised Evaluation of COVID-19 Therapy [RECOVERY]), is assessing multiple treatments in patients hospitalised for COVID-19 (NCT04381936, ISRCTN50189673). In this assessment of DMF performed at 27 UK hospitals, adults were randomly allocated (1:1) to either usual standard of care alone or usual standard of care plus DMF. The primary outcome was clinical status on day 5 measured on a seven-point ordinal scale. Secondary outcomes were time to sustained improvement in clinical status, time to discharge, day 5 peripheral blood oxygenation, day 5 C-reactive protein, and improvement in day 10 clinical status. Between 2 March 2021 and 18 November 2021, 713 patients were enroled in the DMF evaluation, of whom 356 were randomly allocated to receive usual care plus DMF, and 357 to usual care alone. 95% of patients received corticosteroids as part of routine care. There was no evidence of a beneficial effect of DMF on clinical status at day 5 (common odds ratio of unfavourable outcome 1.12; 95% CI 0.86-1.47; p = 0.40). There was no significant effect of DMF on any secondary outcome