During the last six years or so, a number of interesting papers discussed systems with line segments of equilibria, planes of equilibria, and with more general equilibrium configurations. This note draws attention to the fact that such equilibria were considered previously by Miklós Farkas (1932–2007), in papers published in 1984–2005. He called zip bifurcations those involving line segments of equilibria, and velcro bifurcations those involving planes of equilibria. We briefly describe prototypical situations involving zip and velcro bifurcations.

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生态和经济学竞争模型中的邮编和维可牢尼龙搭扣分叉

在过去的六年左右的时间里，许多有趣的论文讨论了具有平衡线段，平衡平面和更一般的平衡配置的系统。该注释提请注意这样一个事实，即MiklósFarkas（1932-2007）在1984-2005年发表的论文中曾考虑过这种平衡。他称涉及平衡线段的拉链分叉，和涉及平衡平面的维可牢尼龙搭扣分叉。我们简要描述涉及拉链和维可牢尼龙搭扣分叉的典型情况。