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Are there any methods or tools to enable someone to visualise/graphically represents the b-tree that underpins an index? The purpose would be to aid in the teaching of how indexes work to enable students to better picture what is going on under the hood.Read more

Here’s my code and output: (*Parametrisation of surface*) s[a_, c_][u_, v_] := {(c + a Cos[v]) Cos[u], (c + a Cos[v]) Sin[u], a Sin[v]}; (*1D curves on the surface*) band[a_, c_][v_] := s[a, c][0, v]; p1[a_, c_][u_] := s[a, c][u, 0]; p2[a_, c_][u_] := s[a, c][u + \[Pi], \[Pi] (1 + Erf[3 (u – \[Pi])])];Read more

I am getting an error while opening the Graphical summary for a survey in SharePoint 2013: Error=The specified view is invalid Below is the ULS log: Application error when access /sites/subsite/Lists/surveyList/summary.aspx, Error=The specified view is invalid. at Microsoft.SharePoint.SPViewCollection.get_Item(Guid guid) at Microsoft.SharePoint.WebPartPages.ListViewWebPart.EnsureListAndView(Boolean requireFullBlownViewSchema) at Microsoft.SharePoint.WebPartPages.ListViewWebPart.Microsoft.SharePoint.WebControls.IWebPartPageComponentProvider.get_WebPartContextualInfo() at Microsoft.SharePoint.WebPartPages.SPWebPartManager.RegisterRibbonTabs() at Microsoft.SharePoint.WebPartPages.SPWebPartManager.OnPreRender(EventArgs e) at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal()Read more

It’s standard nowadays for the real line to be horizontal (negative numbers on the left, positive numbers on the right) and for $ i$ to be above (rather than below) 0 in the complex plane. Were these conventions universally adhered to in the past? For instance, I don’t know how Argand and Wessel and GaussRead more