We describe a family of graphs with queue-number at most 4 but unbounded stack-number. This resolves open problems Heath, Leighton and Rosenberg (1992) Blankenship Oporowski (1999).

understanding the variation of kernel number per unit area (kno) is an important factor in respect yield and in identifying opportunities to increase potential yield. some crop models are for dependence on kernel number prediction to yield simulation. in order to quantify the relationship between kernel number per unit area and influencing parameters (environment and non-environment-based facto...