Videografia: Brasil 500 anos?

500 Solutions

No problem is ever permanently closed. The editor is always pleased to consider for publication new solutions or new insights o n p a s t p r oblems. (1) Determine the set of all c > 0 such that whenever (1) holds, then we have x + y + z xy + yz+ zx. The positive r eals c asked for are those satisfying c 4. From (1), we have xy < c and z = c ; xy x + y + xy. Substituting this value of z into th...

0 Problemas -brasil

PROBLEMA 1: Em que situações podemos trocar as posições dos pon-teiros de um relógio (que tem ponteiros das horas e dos minutos) e continuar obtendo uma hora possível? Mostre que essé e um fenômeno periódico e cal-cule seu período.

Diierent Capacities of a Digraph Jj Anos Kk Orner

The Shannon capacity of every induced subgraph of a perfect graph equals its clique number. However, for the co{normal powers of an odd cycle the super{multiplicativity of the clique number makes the determination of capacity one of the hardest problems in combinatorics. We study the asymptotic growth of induced subgraphs of some particular type in powers of a xed graph. In case of a simple gra...

500 [پانصد] خودنگاره

Mol081083 490..500

Membrane transporter proteins may influence the sensitivity of cancer cells to anticancer drugs that can be recognized as substrates. The purpose of this study was to identify proteins that play a key role in the drug sensitivity of stomach and breast cancer cell lines by measuring the absolute protein expression levels of multiple transporters and other membrane proteins and examining their co...