<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear Michal,<div class=""><br class=""></div><div class="">I’m writing to suggest fixes/improvements to bbold.htf.</div><div class=""><br class=""></div><div class="">My current version is the latest version available from CTAN on my system: <span style="font-family: Menlo; font-size: 11px;" class="">bbold.htf 2020-05-27-14:14</span></div><div class=""><br class=""></div><div class="">My proposed version differs from the current version above in a few code points.The cut-out of the diff (current vs. proposed HTF file) with comments is below:</div><div class=""><br class=""></div><div class=""><div class="">> 'ℿ' '' 5 % Double-Struck Capital Pi; replaces: U+03A0 Greek Capital Letter Pi ???</div><div class="">> '⅀' '' 6 % Double-Struck N-Ary Summation; replaces: U+213F Double-Struck Capital Pi ???</div><div class="">> 'Υ' '' 7 % Greek Capital Letter Upsilon: replaces: U+2140 Double-Struck N-Ary Summation ???</div><div class="">> 'θ' '' 18 % Greek Small Letter Theta; replaces: U+1D703 Mathematical Italic Small Theta</div><div class="">> 'ℼ' '' 25 % Double-Struck Small Pi; replaces: 03C0 Greek Small Letter Pi</div><div class="">> '⦅' '' 40 % Left White Parenthesis; replaces: U+2987 Z Notation Left Image Bracket</div><div class="">> '⦆' '' 41 % Right White Parenthesis; replaces: U+2988 Z Notation Right Image Bracket</div><div class="">> '⸰' '' 61 % Ring Point; replaces "=" ???</div><div class="">> '⟪' '' 94 % Mathematical Left Double Angle Bracket; replaces U+02C6 Modifier Letter Circumflex Accent ("^") ???</div><div class="">> '⟫' '' 95 % Mathematical Right Double Angle Bracket; replaces U+005F Low Line ("underscore") ???</div><div class="">> '–' '' 123 % En Dash; replaces U+007B Left Curly Bracket ???</div><div class="">> '⫾' '' 124 % White Vertical Bar; replaces U+007C Vertical Line </div><div class="">> '—' '' 125 % Em Dash; replaces U+007D Right Curly Bracket ???</div><div class=""><br class=""></div><div class="">The code point is in the third column. The ‘???’ at the end of the line indicates a suggested bug fix (i.e. cases where the current version is obviously off). The other lines improve fidelity of the unicode representation of the font.</div><div class=""><br class=""></div><div class=""><div class="">References:</div><div class=""><br class=""></div><div class=""><a href="https://www.ctan.org/pkg/bbold" class="">https://www.ctan.org/pkg/bbold</a></div><div class=""><a href="https://en.wikipedia.org/wiki/Blackboard_bold" class="">https://en.wikipedia.org/wiki/Blackboard_bold</a></div></div><div class=""><br class=""></div><div class="">For convenience, the mapping tables (with changes highlighted) are printed below:</div><div class=""><br class=""></div><div class="">Current version of bbold.htf:</div><div class=""><br class=""></div><div class=""><div class="">ℾ Δ Θ Λ Ξ Π ℿ ⅀ Φ Ψ Ω α β ℽ δ 𝜖</div><div class="">ζ η 𝜃 ι κ λ μ ν ξ π ρ σ τ υ ϕ χ</div><div class="">ψ ! ” # $ % & ’ ⦇ ⦈ * + , - . /</div><div class="">𝟘 𝟙 𝟚 𝟛 𝟜 𝟝 𝟞 𝟟 𝟠 𝟡 : ; < = > ?</div><div class="">@ 𝔸 𝔹 ℂ 𝔻 𝔼 𝔽 𝔾 ℍ 𝕀 𝕁 𝕂 𝕃 𝕄 ℕ 𝕆</div><div class="">ℙ ℚ ℝ 𝕊 𝕋 𝕌 𝕍 𝕎 𝕏 𝕐 ℤ ⟦ \ ⟧ ˆ _</div><div class="">‘ 𝕒 𝕓 𝕔 𝕕 𝕖 𝕗 𝕘 𝕙 𝕚 𝕛 𝕜 𝕝 𝕞 𝕟 𝕠</div><div class="">𝕡 𝕢 𝕣 𝕤 𝕥 𝕦 𝕧 𝕨 𝕩 𝕪 𝕫 { | } “ ω</div></div><div class=""><br class=""></div><div class="">My proposed version:</div><div class=""><br class=""></div><div class=""><div class=""><font style="font-style: normal;" class="">ℾ Δ Θ Λ Ξ <span style="background-color: rgb(0, 253, 255);" class="">ℿ ⅀ Υ</span> Φ Ψ Ω α β ℽ δ 𝜖</font></div><div class=""><span style="font-style: normal;" class="">ζ η <span style="background-color: rgb(0, 253, 255);" class="">θ</span> ι κ λ μ ν ξ <span style="background-color: rgb(0, 253, 255);" class="">ℼ</span> ρ σ τ υ ϕ χ</span></div><div class=""><span style="font-style: normal;" class="">ψ ! ” # $ % & ’ <span style="background-color: rgb(0, 253, 255);" class="">⦅ ⦆</span> * + , - . /</span></div><div class=""><span style="font-style: normal;" class="">𝟘 𝟙 𝟚 𝟛 𝟜 𝟝 𝟞 𝟟 𝟠 𝟡 : ; < <span style="background-color: rgb(0, 253, 255);" class="">⸰</span> > ?</span></div><div class=""><span style="font-style: normal;" class="">@ 𝔸 𝔹 ℂ 𝔻 𝔼 𝔽 𝔾 ℍ 𝕀 𝕁 𝕂 𝕃 𝕄 ℕ 𝕆</span></div><div class=""><span style="font-style: normal;" class="">ℙ ℚ ℝ 𝕊 𝕋 𝕌 𝕍 𝕎 𝕏 𝕐 ℤ ⟦ \ ⟧ <span style="background-color: rgb(0, 253, 255);" class="">⟪ ⟫</span></span></div><div class=""><span style="font-style: normal;" class="">‘ 𝕒 𝕓 𝕔 𝕕 𝕖 𝕗 𝕘 𝕙 𝕚 𝕛 𝕜 𝕝 𝕞 𝕟 𝕠</span></div><div class=""><font style="font-style: normal;" class="">𝕡 𝕢 𝕣 𝕤 𝕥 𝕦 𝕧 𝕨 𝕩 𝕪 𝕫 <span style="background-color: rgb(0, 253, 255);" class="">– ⫾ —</span> “ ω</font></div></div><div class=""><br class=""></div><div class="">The output of pdftex testfont is also attached which, together with the two tables above, clearly shows the bugs in the current version of bbold.htf as well as the improvements introduced by the proposed changes:</div><div class=""><br class=""></div><div class=""></div></div></body></html>