Gallery

This portfolio presents selected materials from my work on information systems and proof systems. These include interfaces for temporal information, computational architectures, formal modelling, automated deductions, and proof visualizations. Together, these materials illustrate the relationship between the theoretical foundations of these systems and their implementation as working software.

Tagline lockup, landscape

Ordered typing derivation for canonicalization of string-encoded temporal information in Gentzen-style intuitionistic natural deduction, and a transient recordation indicium

Typing and reduction semantics for a λ-term in a judgmental polymorphic system.

Partially completed transition, and a transient initials–full-name tooltip

Full-month–year tooltip, related-instance retrieval animation, and transient recordation indicium

A proof system effects a linear sequent derivation with additive and multiplicative connectives.

An ordered sequent derivation with fuse, external choice, and the under residual.

Terms of Service, lower portion of table of contents, narrow

Ordered typing derivation for canonicalization of string-encoded temporal information in Gentzen-style intuitionistic natural deduction

Typing and reduction semantics for a linear λ-term in a narrow environment.

Upload temporal information, with video and its controls

Lazy tables, with elements ranging over schedule-name initials, and an initials–full-name tooltip, sorted alphabetically, narrow

Search term "new" and its ranked matches

An inductive structure represents a quadruple of frame stacks

A first-order linear sequent derivation with universal quantification and linear implication.

Low- and high-level reductions for a simple bitwise expression.

A simple propositional natural-deduction proof and its corresponding truth table.

Low- and high-level reductions for a bitwise expression, with its low-level proof tree positioned left.

Low- and high-level reductions for a bitwise expression, with its low-level proof tree positioned right.

A derivation of a simple modal formula with the box modality.

Typing and reduction semantics for a nested λ-function that maps over a sequence.

Sponsored Schedule Advertising order confirmation

Contextual action sheet, narrow

Video and its controls below timetable

Left-to-right transition toward lazy timetables

Upper portion of Control Center

Terms of Service, upper portion, narrow

Business inquiries form

Temporal information over date range saved, with ordered typing derivation

Edit temporal information, with hour- and minute-controller indicia

Canonicalization with lazy timetables, with three timetable columns

Inductively-defined auxiliary structures

Upper portion of Terms of Service

Lazy table, sorted alphabetically

Late intermediate transition state

Search term "sea" and its ranked matches, narrow

Terms for Sponsored Schedule Advertising

"see more like this" animation, and "Unsaved" toggle

Link to a Timesort schedule, with boilerplate code

Upload temporal information, with video and its controls, narrow

"save in range" tooltip

Sponsored Schedule Advertising form, with a message

About our name

Canonicalization of one date–one time German text without reference, and a transient recordation indicium

Options for temporal information, with transient recordation indicium, narrow.png

Media inquiries form, narrow

Bidirectionally-traversed timeline

Timesort — derivation of standardized information

Upload temporal information, upper portion

Save over user-defined date range

Ordered typing derivation for canonicalization of Japanese date–time text with reference, and a transient recordation indicium

Canonicalization of one date–one time Japanese text without reference, and a transient recordation indicium

Transient year–month tooltip and recordation indicium, narrow.png

Phone contact

Transient full-month–year tooltip

Regular language of identifiers

Wordmark

Registration confirmation

Reference underline

Privacy Policy, upper portion

Ordered typing derivation for canonicalization of date range

Embed a timetable, with boilerplate code

Terms of Service, lower portion, narrow

Temporal information saved, narrow

Right-to-left transition toward lazy timetables

Edit email

Glyph

Contextual action sheet

Search term "2" and its ranked matches

Canonicalization of installments of a series

Login

Saves recorded, and a transient promoted schedule tooltip

Upload temporal information, lower portion, with visibility options

Ordered typing derivation for canonicalization, with parenthetical note

Reference–date difference logical specification

Sponsored Schedule Engagements by date

Visit history

Sign up

Tagline lockup, narrow

Automated response to inquiry

Ordered typing derivation for canonicalization, and four date ranges

Ordered typing derivation for canonicalization of shorter-length string-encoded temporal information in Gentzen-style intuitionistic natural deduction

Order confirmation in foreign language

Edit temporal information, with video and its controls, and with logical constant for importance marking

Small lazy table, sorted alphabetically

Options for temporal information

Ordered Derivations of Canonical Forms abstract

Timetable embedding in third-party environment, with ordered typing derivation for canonicalization of string-encoded date–time information

Timetable embedding in third-party environment, with ordered typing derivation for canonicalization of string-encoded temporal information

Inductive structure representing quadruple of frame stacks, distinctive upper fade along menu

Process diagram

Dynamic superseding

An Inductive Structure for Stacking Composition abstract

Abstract grammar for frame identifier trees

Process diagram for frame push

Abstract grammar for frame trees

Illustration of frame push

Tagline lockup revisited