1. 2017-08-14 Re: [Rd] arithmetic with zero-column data.frames r-devel Martin Maechler 2. 2017-08-09 Re: [Rd] arithmetic with zero-column data.frames r-devel Martin Maechler 3. 2017-08-09 Re: [Rd] arithmetic with zero-column data.frames r-devel Martin Maechler 4. 2017-08-08 [Rd] arithmetic with zero-column data.frames r-devel William Dunlap via