“Christopher is a very intense, organized individual who is geared to produce results for his client. He has a thorough understanding of the web and how and what needs to be done to make a website work for his business client.”
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"If you can't measure it, you can't improve it." 36 KPIs every CEO needs to know: The quote above is by Peter Drucker. He's known as the "father of…
"If you can't measure it, you can't improve it." 36 KPIs every CEO needs to know: The quote above is by Peter Drucker. He's known as the "father of…
Liked by Christopher Pappas
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Last week we hosted our '23 Client Summit in downtown Houston, TX. I want to thank all our fantastic clients who traveled in and participated (some…
Last week we hosted our '23 Client Summit in downtown Houston, TX. I want to thank all our fantastic clients who traveled in and participated (some…
Shared by Christopher Pappas
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I'm incredibly proud of our Forthea team for winning PPC (Paid Search Marketing) Agency of the Year from the US Agency Awards! This award speaks to…
I'm incredibly proud of our Forthea team for winning PPC (Paid Search Marketing) Agency of the Year from the US Agency Awards! This award speaks to…
Shared by Christopher Pappas
Experience & Education
Publications
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Supervaluations Debugged
Mind. 118 (472), 901-933.
Supervaluational accounts of vagueness have come under assault from Timothy Williamson for failing to provide either a sufficiently classical logic or a disquotational notion of truth, and from Crispin Wright and others for incorporating a notion of higher-order vagueness, via the determinacy operator, which leads to contradiction when combined with intuitively appealing ‘gap principles’. We argue that these criticisms of supervaluation theory depend on giving supertruth an unnecessarily…
Supervaluational accounts of vagueness have come under assault from Timothy Williamson for failing to provide either a sufficiently classical logic or a disquotational notion of truth, and from Crispin Wright and others for incorporating a notion of higher-order vagueness, via the determinacy operator, which leads to contradiction when combined with intuitively appealing ‘gap principles’. We argue that these criticisms of supervaluation theory depend on giving supertruth an unnecessarily central role in that theory as the sole notion of truth, rather than as one mode of truth. Allowing for the co-existence of supertruth and local truth, we define a notion of local entailment in supervaluation theory, and show that the resulting logic is fully classical and allows for the truth of the gap principles. Finally, we argue that both supertruth and local truth are disquotational, when disquotational principles are properly understood.
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Solving the maximum representation problem to prioritize areas...
Diversity & Distributions.14 (3), 493-508.
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The Logic of Expectation
The University of Texas at Austin - Master's Report
This paper explores the duality between two common frameworks used for representing uncertainty: (i) the probabilistic framework; and (ii) the expectation-based framework. The formal equivalence of the two systems is proved in rigorous detail. In particular, we derive the axioms for probabilities
as theorems in expectation theory–while the fact that such a derivation should be
possible is generally accepted in the literature (Whittle, 2000), to the best of our
knowledge, ours is the…This paper explores the duality between two common frameworks used for representing uncertainty: (i) the probabilistic framework; and (ii) the expectation-based framework. The formal equivalence of the two systems is proved in rigorous detail. In particular, we derive the axioms for probabilities
as theorems in expectation theory–while the fact that such a derivation should be
possible is generally accepted in the literature (Whittle, 2000), to the best of our
knowledge, ours is the first explicit proof. A common biological problem is formalized within both frameworks and used to illustrate how the two frameworks differ. It is argued that the expectation-based framework is preferable over the probabilistic framework in this case, due to reasons of context. -
Place prioritization for biodiversity conservation using probabilistic surrogate distribution data
Diversity & Distributions. 10 (2), 125-133.
We analyse optimal and heuristic place prioritization algorithms for biodiversity conservation area network design which can use probabilistic data on the distribution of surrogates for biodiversity. We show how an Expected Surrogate Set Covering Problem (ESSCP) and a Maximal Expected Surrogate Covering Problem (MESCP) can be linearized for computationally efficient solution. For the ESSCP, we study the performance of two optimization software packages (XPRESS and CPLEX) and five heuristic…
We analyse optimal and heuristic place prioritization algorithms for biodiversity conservation area network design which can use probabilistic data on the distribution of surrogates for biodiversity. We show how an Expected Surrogate Set Covering Problem (ESSCP) and a Maximal Expected Surrogate Covering Problem (MESCP) can be linearized for computationally efficient solution. For the ESSCP, we study the performance of two optimization software packages (XPRESS and CPLEX) and five heuristic algorithms based on traditional measures of complementarity and rarity as well as the Shannon and Simpson indices of α-diversity which are being used in this context for the first time. On small artificial data sets the optimal place prioritization algorithms often produced more economical solutions than the heuristic algorithms, though not always ones guaranteed to be optimal. However, with large data sets, the optimal algorithms often required long computation times and produced no better results than heuristic ones. Thus there is generally little reason to prefer optimal to heuristic algorithms with probabilistic data sets.We analyse optimal and heuristic place prioritization algorithms for biodiversity conservation area network design which can use probabilistic data on the distribution of surrogates for biodiversity. We show how an Expected Surrogate Set Covering Problem (ESSCP) and a Maximal Expected Surrogate Covering Problem (MESCP) can be linearized for computationally efficient solution. For the ESSCP, we study the performance of two optimization software packages (XPRESS and CPLEX) and five heuristic algorithms based on traditional measures of complementarity and rarity as well as the Shannon and Simpson indices of α-diversity which are being used in this context for the first time. Continued...
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Honors & Awards
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Top 40 Business Leaders Under 40
Houston Business Journal
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Phi Beta Kappa
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University Fellowship
The University of Texas at Austin
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We are very excited to announce that we are 2022 U.S. Search Award Winners! We were recognized for the following: Best Use of Search - Real Estate…
We are very excited to announce that we are 2022 U.S. Search Award Winners! We were recognized for the following: Best Use of Search - Real Estate…
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Grateful and humbled to be part of a firm/family that realizes the importance of making the world a better place. Perficient is enabling employees to…
Grateful and humbled to be part of a firm/family that realizes the importance of making the world a better place. Perficient is enabling employees to…
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