followeth.

FOOTNOTES:

[A] In our Author's _Lectiones Opticæ_, Part I. Sect. IV. Prop 29, 30,
there is an elegant Method of determining these _Foci_; not only in
spherical Surfaces, but likewise in any other curved Figure whatever:
And in Prop. 32, 33, the same thing is done for any Ray lying out of the
Axis.

[B] _Ibid._ Prop. 34.




_PROPOSITIONS._



_PROP._ I. THEOR. I.

breakpoint-infix($breakpoint, $grid-breakpoints);\n\n    @each $prop, $abbrev in (margin: m, padding: p) {\n      @each $size, $length in $spacers {\n        .#{$abbrev}#{$infix}-#{$size} { #{$prop}: $length !important; }\n        .#{$abbrev}t#{$infix}-#{$size},\n        .#{$abbrev}y#{$infix}-#{$size} {\n          #{$prop}-top: $length !important;\n        }\n        .#{$abbrev}r#{$infix}-#{$size},\n        .#{$abbrev}x#{$infix}-#{$size} {\n          #{$prop}-right: $length !important;\n        }\n        .#...

breakpoint-infix($breakpoint, $grid-breakpoints);\n\n    @each $prop, $abbrev in (margin: m, padding: p) {\n      @each $size, $length in $spacers {\n        .#{$abbrev}#{$infix}-#{$size} { #{$prop}: $length !important; }\n        .#{$abbrev}t#{$infix}-#{$size},\n        .#{$abbrev}y#{$infix}-#{$size} {\n          #{$prop}-top: $length !important;\n        }\n        .#{$abbrev}r#{$infix}-#{$size},\n        .#{$abbrev}x#{$infix}-#{$size} {\n          #{$prop}-right: $length !important;\n        }\n        .#...

    *   XLA reduction emitter is deterministic when the environment variable
        `TF_DETERMINISTIC_OPS` is set to "true" or "1". This extends
        deterministic `tf.nn.bias_add` back-prop functionality (and therefore
        also deterministic back-prop of bias-addition in Keras layers) to
        include when XLA JIT compilation is enabled.
    *   Fix problem, when running on a CUDA GPU and when either environment